I wanted to give everyone an important follow up, Kooks called me about these disappointing results. In our discussion, they let me know that the downsize to a 2.5" flange was intentional because the factory cat flange is apparently the same 2.5" inlet and they wanted to avoid a rough transition. I will verify that size in the near future when we do our follow up tests. The box was mislabeled. Additionally, we will run the car again before replacing the cats with the kooks cats to see if we get different results. And finally, and most importantly, kooks is happy to work with us to make sure their product does perform. So we may even test a revision to the product after all the tests are done. They seem committed to making sure the right product gets in all of our hands!
The stock header still has a larger exit hole. There is literally no excuse for under-performance. Kooks made a mistake at some point, and their best move now is to rewind, fix the mistake and send everyone out the new proper design THAT THEY TEST BEFORE THEY SEND ANYTHING ELSE OUT. There is nothing else to talk about.
im glad that your calling these people out and not giving anybody free passes to make questionable products and try to pass it on to the public to make a fast buck ....love your integrity and honesty and keep up the good work
This is why I trust you more than any other GM performance shop. I don't care what people are posting about measurements, cats not being new or any of that bull. Kooks messed up on this one and it's obvious the difference in collector size even just by seeing this video. Keep up the awesome work and videos!
Complete Street Performance true I’m sure a properly designed header would pick up some power, like you said in the video the power loss is probably from the neck down in the collector. I think LTH makes a header for the c8 wonder if they actually pick up power vs the stock ones and kooks
So instead of the KOOKS Headers being a ‘power adder’, they’re actually a power subtracter. I’ll wait for ARH but ideally I’d like to just swap cats and find a way to do new tips. BTW what is the size of the OE headers in comparison to KOOKS 17/8
It sounds the same because you didnt put the Kooks high flow cats on it, 6 inches of extra primary isnt going to net much sound difference without changing the rest of the exhaust, as for the pipe diameter thats a crock of shit, it should be a full 3" which could attest to the power loss, thats just my take on it.
Curious what is the cost of the kooks headers? And what would it cost to have the average guy have them installed by your shop? It has to be hours of labor
So you spend $1,000 or more on Kooks Headers to lose horsepower 😂 what the HELL. So it's time FOR CSP to develop a header for the C8. Also I'm glad that no cats were killed during the filming of this video.
Most of the gains will come from deleting the cats or using a good high flow cat. It’s very difficult to make a better short tube header than what GM has already done. You would need to actually make real real tubes which isn’t possible on the C8
Talk about timely! I just thought about or ordered the Kooks headers with their 20 horsepower gain. Kooks, was a bit foggy about the set up of their headers with regards to: factory cats; factory exhausts, etc. So the claim appears to be a 20 hoursepower and a torque increase with a straight Kook's swap without any other changes. I'm hoping that this presentation tells the truth about what the Kooks headers do or don't do and why. That's what I for one want to know (LT2/Z51) Stingray C8. AF
These headers look to be really well made but I find that the basic design is a bit strange. Normally, a normally aspirated 6.2 motor works well with a 2 1/2 inch collector but a 1 5/8 or 1 3/4 inch primary. My experience with headers on my C6 Z06 was that 1 7/8 primaries worked better on a larger motor and with corresponding 3 inch collectors. Personally, I would have chosen a 1 3/4 inch primary to go with a 2 3/4 inch collector. However this wouldn’t make a big difference but some. Another factor is the increased scavenging on the overlap of the valve event leans out the fuel mixture and we ALWAYS had to tune the ECU to compensate. That is when the power gains showed up on the dyno. Personally, I would never add long tube headers to a stock motor until tuning the ECU is available. Finally, the stock header is fairly good. Don’t expect the same gains on the LS2 that you would get on a motor with a conventional log type manifold. As an example, I would like to use my Z06 experience. Compared to a log type manifold, the hydro formed individual runners were worth about 6 or 7 horsepower. Guys that added shorty headers (similar to the LS2 headers) saw about 10 horsepower over stock but didn’t need tuning because the scavenging wasn’t much more efficient. Long tube headers were worth 22 horsepower over stock but only after tuning the A/F ratios back to normal which was necessary. I don’t claim to be any kind of expert but just wanted to share my experience to help lend some perspective to the subject. I hope this helps some. Cheers, Gary. P.S. As a side note, my final combination was worth 33 horsepower. That included B&B long tube headers, no cats and running through Akrapovic titanium exhaust that had a much more efficient “open” mode than the stock dual mode mufflers. Plus, I saved 54 pounds of weight👌😁. And it was LOUD! Of course, Andrew, I am sure you know all this and I posted it hoping to pass along some info to some of the subscribers that might get sidetracked by other well meaning but inexperienced posters.
King-O-Vetts just by looking at the air fuel ratio you can tell that the car needs more fuel or not in this case it didn’t and lost power which means the kooks headers did not flow more then the stock manifolds tuning wouldn’t of helped this situation he left everything alone to show results these headers are garbage plane and simple now if they flowed more air a tune would of been warranted but he would of seen that on the dyno
Let's us know how it turns out and if they redesigned them. My Kooks green cats blew out. As did so many others on the forums. ARH has been solid so far.
Wow... That is pretty shitty results. Thanks for the unbiased review of these. Super weird that they would release it with a smaller collector than stock. What a waste of money those would be.
shockingly bad... I ran into a similiar thing when just replacing the gf's flexpipe on her focus... ordered aftermarket and the thing had smaller tubing, and smaller port openings than stock... I tried it but it lost torque and hp and felt restricted... put the original back and regained the hp.. its wild that theres no oversight required that these things at least match the original diameters .
@@anthonycosta1776 in this case, id take the cash in my pocket, the additional power and factory heat shielding... I'd take those off and ram them up Kooks azz!
You are the second or third to do headers. The biggest gain was 7 hp, 2 hp and then yours. I think chevy nailed the design and Max engineered the manifold. Just think you would have been perfectly happy if you gained 20 hp. for $1200 plus installation. Kooks couldn't do it. I'm not doing anything but porting the exhaust manifold. If I do anything to it. It's pretty badass for massed produced.
OSHA is going to get you for flip flops in the shop. Is any of that heat shielding going back on? The new headers better make a tons of power for that round of automobile twister you had to playtime get the factory units out!
Bummer, but thanks for posting this data. Kooks wanted to be first to market - again. They put out another dud further tarnishing their reputation of being a leader in performance. This strategy will be the demise of Kooks. Remember when kooks was the leader in 4th gen Fbody? The green cat C7 issue is a prime example. I'll wait for ARH or CSP to develop something solid for my C8.
Sounded worse with the Kooks too. Emelia installed the Kooks but she also got high flow cats. A smaller collector is surprising for an aftermarket part.
How can a company release something like that? Seems like they would of tested it beforehand. But I’m not sure how much gain there is to be had over that factory manifold.
Kooks used to be really good but now it seems they don’t test there products obviously they didn’t test for power maybe just for fitment which makes me wonder how many other headers they sell have issues with not making power if you add a full exhaust with these headers you wouldn’t even know when you got tuned what made the power or what didn’t most car guys don’t go piece by piece as it cost money to get retuned. So we usually toss everything on and get tuned I am not buying from kooks good thing I got my headers from Texas speed
Kooks made no bones about it. 20 Horsepower with the header as they constructed it. How on earth could a company like Kooks put a restriction onto their headers, putting a fastener that is the opposite, for example, of what porting and port matching does for any car? You used the words, "Bull Shit." I hope you send those headers back along with a scathing letter. Having just put my credit card order in, I'm not paying for, nor getting the headers. Now I know why they didn't answer my e-mail to them. This reminds me of the kind of BS that Hennesy pulled according to some former employees that appeared on a utube vlog. This also smacks of bait and switch. The appearance of the headers; the much longer unbent lengths; the smoother mandrel bends all appear to scream horse power. But a loss during the entire Rev range? Total BS. These people did not pay attention to one of the basics of automotive exhaust work. AF
The stock header is better just looking at it. It's a really good stock header. Better flow into a tighter collector for best N/A performance. When I say better flow the replacement header has 4 bends vs 1.5 on the stock.
You should have known those headers would do nothing as GM Corvette engineers said their exhaust manifolds were practically headers and you could not improve upon the current exhaust system. And by koox coming out with a two and a half inch collector give me a break I'd sue the bastards in mean at least obviously ship them back and get your money back you're not going to get any power on the exhaust side. And no one's going to be able to crack the computer for years it will be into the z06 by then. Jeezz.
Good that you are putting the Kooks Headers to the test. I've heard they say you'll gain up to 27HP. I would think they should make them to remount the heat shields. Thanks for putting them to the test. The Dyno speaks or it self. I believe high flow cats and a aftermarket lighter exhaust could make a gain in HP. Thanks for sàviñg everyone money!¡
If I would seen those collector outlet diameter was almost a half inch smaller i would have packed them up sent them back aborting the project. Now your stuck with shitty headers.
Max Fly He clearly said at the beginning he was going to upgrade in stages and measure the gains at each stage! It’s the only way to assess how much gain is being provided by each part!
Dear CSP. Having had the factory collectors off, I am curious about one thing. Did you check the exits of the exhaust to look for any little metal or ridges that might obstruct exit and provide hot or rough spots? Same with the manifold entrances themselves. If there was any at all seen, would, "Port Matching," yield any gains? In the old days, porting and polishing often resulted in a few extra horse power (torque, I'm unsure about). This would be something as one of your subscribers that I'd really like to know about. AF (C8 VIN: 01063, built on 02/20/2020) LT2/Z51
I'm sorry! If you don't get a hold of us on the phone you can definitely email us at sales@cspracing.com which is much less of a chance it will get dropped between the cracks. We are working on a better phone system though so that doesn't happen in the future.
Thats a shame bro...when I saw the diameter difference between the kooks collector and also the port opening on the kooks vs stock, I Knew that was a recipe for Less not more...How stuff like that gets into production is beyond me, who the heck OK'd the dimensions on the kooks b4 mass production? alot of othet youtubers went with kooks as well with similiar results... Are there no other companies making decent headers for c8?
Richard holdener did testing on the new LT engine family and found that they didn't gain any performance from headers. Anyone looking to do performance mods should save their money and put towards something else. Actually saved a friend of mine from buying them and his tuner confirmed when he double checked
If arh would like to send me a set I'll be happy to test. At this point though I've already spent thousands to do this test so I'm not interested in spending more lol
Those stock headers appear to be a tri-y design not 4 into 1 like the kooks. Tri-y will always outflow due to exhaust scavenging working better when the pipes match the engine timing.
Well since no one has cracked the computer, and it will not be done anytime soon this is no shock. If you can’t tune the car for aftermarket parts your wasting your money.
With the C8 being such a new car, give these manufacturers some time developing these parts. Also without a tune doesn't the computer need some time to adjust to these new performance parts?
most (if not all) cars gain HP when they receive better exhaust even if no additional ecu tuning is done, and they gain even more with a tune. you can also do ecu tuning on stock headers so that they produce more power since factory tuning is geared towards meeting regulations. don't need aftermarket headers for that gain in HP. i don't think this is a tuning issue. 3 inch vs. 2.5 inch collector is kind of a dead giveaway.
That's Bad news for KooKs .... try using the sport cats that chevy dude used in his c8,,, i think it gave him more power...change the cats and you will have more power & more better sound
Since your stock headers are off the car I would try to bore the insides out as much as possible. (Maybe do a ceramic coating too, to keep the heat down.) And then get a high flow cat axel back exhaust set up.
I think it's more for looks than anything. They look way better in that engine bay. What I want to see made are some equal length headers for the C8 just to really confuse people when you drive by.
I wanted to give everyone an important follow up, Kooks called me about these disappointing results. In our discussion, they let me know that the downsize to a 2.5" flange was intentional because the factory cat flange is apparently the same 2.5" inlet and they wanted to avoid a rough transition. I will verify that size in the near future when we do our follow up tests. The box was mislabeled.
Additionally, we will run the car again before replacing the cats with the kooks cats to see if we get different results.
And finally, and most importantly, kooks is happy to work with us to make sure their product does perform. So we may even test a revision to the product after all the tests are done. They seem committed to making sure the right product gets in all of our hands!
The stock header still has a larger exit hole. There is literally no excuse for under-performance. Kooks made a mistake at some point, and their best move now is to rewind, fix the mistake and send everyone out the new proper design THAT THEY TEST BEFORE THEY SEND ANYTHING ELSE OUT.
There is nothing else to talk about.
Wow crazy it lost. I'd be so sad.
you should try porting and polishing the factory headers. might gain a few hp!
Very sad... I would not be sending them nice emails or phone calls.
See what makes more power with proper tuning done.
Looks gonna come out on top
im glad that your calling these people out and not giving anybody free passes to make questionable products and try to pass it on to the public to make a fast buck ....love your integrity and honesty and keep up the good work
That's because he paid for them. I wonder what he would say if the were "FREE".
This is why I trust you more than any other GM performance shop. I don't care what people are posting about measurements, cats not being new or any of that bull. Kooks messed up on this one and it's obvious the difference in collector size even just by seeing this video. Keep up the awesome work and videos!
Maybe....GM engineers actually know what there doing.....hmmm
Ik It’s not like they have millions upon millions invested in research and development 😂
True, but even with that previous generations have been able to be improved upon...
Ok Karen
Gm engineers for sure know what’s up 🤙
Complete Street Performance true I’m sure a properly designed header would pick up some power, like you said in the video the power loss is probably from the neck down in the collector. I think LTH makes a header for the c8 wonder if they actually pick up power vs the stock ones and kooks
This also happened to CorvettesDirect
It’s great to see and hear someone telling it like it really is and not pushing a defective product!
Those stock headers look beefy lol
So glad we have people like you willing to burn your money in a trashcan so the rest of us don't have to, thank you
C8's already have headers.
I love the unbiased videos posted! Great comparison and thank you for the honesty.
So instead of the KOOKS Headers being a ‘power adder’, they’re actually a power subtracter. I’ll wait for ARH but ideally I’d like to just swap cats and find a way to do new tips. BTW what is the size of the OE headers in comparison to KOOKS 17/8
ARH is wrapping up their product now, be out soon !!
It sounds the same because you didnt put the Kooks high flow cats on it, 6 inches of extra primary isnt going to net much sound difference without changing the rest of the exhaust, as for the pipe diameter thats a crock of shit, it should be a full 3" which could attest to the power loss, thats just my take on it.
Glad you're being honest and transparent, saves people A LOT of money.
Curious what is the cost of the kooks headers? And what would it cost to have the average guy have them installed by your shop? It has to be hours of labor
I would guess $3000 total
Kooks needs to follow the old adage measure twice cut once. It was very obvious the GM collector was a lot bigger.
What about hi flow cats
Great video can’t wait for more C8 content! I need to call you when I get my C8 cause I definitely want to do some mods!
Just as well Emelia opted for their green cats then
So you spend $1,000 or more on Kooks Headers to lose horsepower 😂 what the HELL. So it's time FOR CSP to develop a header for the C8. Also I'm glad that no cats were killed during the filming of this video.
Your the second person with kooks headers for the c8 that lost power. Hmmmm.
The factory header looks hard to improve on if you have restriction it's more likely cat back.
Most of the gains will come from deleting the cats or using a good high flow cat. It’s very difficult to make a better short tube header than what GM has already done. You would need to actually make real real tubes which isn’t possible on the C8
Emm Hartford going to be pissed
The restriction, extra sound and power gain are all in the cats. The stock headers are very well designed.
Please avoid the toe shots!
Talk about timely! I just thought about or ordered the Kooks headers with their 20 horsepower gain. Kooks, was a bit foggy about the set up of their headers with regards to: factory cats; factory exhausts, etc. So the claim appears to be a 20 hoursepower and a torque increase with a straight Kook's swap without any other changes. I'm hoping that this presentation tells the truth about what the Kooks headers do or don't do and why. That's what I for one want to know (LT2/Z51) Stingray C8. AF
These headers look to be really well made but I find that the basic design is a bit strange. Normally, a normally aspirated 6.2 motor works well with a 2 1/2 inch collector but a 1 5/8 or 1 3/4 inch primary. My experience with headers on my C6 Z06 was that 1 7/8 primaries worked better on a larger motor and with corresponding 3 inch collectors. Personally, I would have chosen a 1 3/4 inch primary to go with a 2 3/4 inch collector. However this wouldn’t make a big difference but some. Another factor is the increased scavenging on the overlap of the valve event leans out the fuel mixture and we ALWAYS had to tune the ECU to compensate. That is when the power gains showed up on the dyno. Personally, I would never add long tube headers to a stock motor until tuning the ECU is available. Finally, the stock header is fairly good. Don’t expect the same gains on the LS2 that you would get on a motor with a conventional log type manifold. As an example, I would like to use my Z06 experience. Compared to a log type manifold, the hydro formed individual runners were worth about 6 or 7 horsepower. Guys that added shorty headers (similar to the LS2 headers) saw about 10 horsepower over stock but didn’t need tuning because the scavenging wasn’t much more efficient. Long tube headers were worth 22 horsepower over stock but only after tuning the A/F ratios back to normal which was necessary. I don’t claim to be any kind of expert but just wanted to share my experience to help lend some perspective to the subject. I hope this helps some. Cheers, Gary. P.S. As a side note, my final combination was worth 33 horsepower. That included B&B long tube headers, no cats and running through Akrapovic titanium exhaust that had a much more efficient “open” mode than the stock dual mode mufflers. Plus, I saved 54 pounds of weight👌😁. And it was LOUD! Of course, Andrew, I am sure you know all this and I posted it hoping to pass along some info to some of the subscribers that might get sidetracked by other well meaning but inexperienced posters.
King-O-Vetts just by looking at the air fuel ratio you can tell that the car needs more fuel or not in this case it didn’t and lost power which means the kooks headers did not flow more then the stock manifolds tuning wouldn’t of helped this situation he left everything alone to show results these headers are garbage plane and simple now if they flowed more air a tune would of been warranted but he would of seen that on the dyno
Kooks won’t like that
What about fire risk with the lack of heat shielding?
I just got the Green cats from kooks waiting on the heat blankets looks like a good choice. Thanks for the video and info
Let's us know how it turns out and if they redesigned them. My Kooks green cats blew out. As did so many others on the forums. ARH has been solid so far.
Arh uses the same cats. Which are very good cats, however I have seen a few failures too.
Wow. They look really nice in there too
Wow... That is pretty shitty results. Thanks for the unbiased review of these. Super weird that they would release it with a smaller collector than stock. What a waste of money those would be.
Wonder what they were thinking by reducing collector diameter. "That's really bad"
shockingly bad... I ran into a similiar thing when just replacing the gf's flexpipe on her focus... ordered aftermarket and the thing had smaller tubing, and smaller port openings than stock... I tried it but it lost torque and hp and felt restricted... put the original back and regained the hp.. its wild that theres no oversight required that these things at least match the original diameters .
Did kooks potentially rush something to market?!? They are one of the premium manufacturers out there and that whole collector BS is unacceptable.
ARH ARE THE ABSOLUTE BEST HEADERS.
@@anthonycosta1776 in this case, id take the cash in my pocket, the additional power and factory heat shielding... I'd take those off and ram them up Kooks azz!
So why are the torque numbers intentionally omitted?
HP is calculated from torque so you can back calculate the torque. It's a well known formula. (HP * 5252) / RPM = Torque
It appears to be a waste of $1500
Awesome video. I like how you are honest about products!
You are the second or third to do headers. The biggest gain was 7 hp, 2 hp and then yours. I think chevy nailed the design and Max engineered the manifold. Just think you would have been perfectly happy if you gained 20 hp. for $1200 plus installation. Kooks couldn't do it. I'm not doing anything but porting the exhaust manifold. If I do anything to it. It's pretty badass for massed produced.
OSHA is going to get you for flip flops in the shop. Is any of that heat shielding going back on? The new headers better make a tons of power for that round of automobile twister you had to playtime get the factory units out!
Maybe you should have put on the green cats from Kooks....then you would need to tune it
LOL, total fail.. Leave the car stock and stop trying to be a UA-cam C8 superstar..
I wonder if American Racing has a better product coming.
It can't be inexpensive changing those headers, and to lose HP after all that, now that's sad .
Bummer, but thanks for posting this data. Kooks wanted to be first to market - again. They put out another dud further tarnishing their reputation of being a leader in performance. This strategy will be the demise of Kooks. Remember when kooks was the leader in 4th gen Fbody? The green cat C7 issue is a prime example. I'll wait for ARH or CSP to develop something solid for my C8.
what a shame...props for giving the honest feedback 👍
Sounded worse with the Kooks too. Emelia installed the Kooks but she also got high flow cats. A smaller collector is surprising for an aftermarket part.
I'm betting the CAD schematics from GM show two and a half inch but it's actually bigger, and Kooks probably designed it beforehand by CAD.
Mannn ohh mannn have I heard that before...... wheres the 3?! Smh 🤦🏼♂️
kooks are garbage.. that thing only makes 25 rwhp more than my LS3
Kooks is overrated and overpriced
How can a company release something like that? Seems like they would of tested it beforehand. But I’m not sure how much gain there is to be had over that factory manifold.
Have you still got the cats installed with the kooks headers ?
Kooks used to be really good but now it seems they don’t test there products obviously they didn’t test for power maybe just for fitment which makes me wonder how many other headers they sell have issues with not making power if you add a full exhaust with these headers you wouldn’t even know when you got tuned what made the power or what didn’t most car guys don’t go piece by piece as it cost money to get retuned. So we usually toss everything on and get tuned I am not buying from kooks good thing I got my headers from Texas speed
Kooks got a bad return rep. Didn't you experience something 🤔 similar can't remember what product but they wouldn't do it.
Kooks made no bones about it. 20 Horsepower with the header as they constructed it. How on earth could a company like Kooks put a restriction onto their headers, putting a fastener that is the opposite, for example, of what porting and port matching does for any car? You used the words, "Bull Shit." I hope you send those headers back along with a scathing letter. Having just put my credit card order in, I'm not paying for, nor getting the headers. Now I know why they didn't answer my e-mail to them. This reminds me of the kind of BS that Hennesy pulled according to some former employees that appeared on a utube vlog. This also smacks of bait and switch. The appearance of the headers; the much longer unbent lengths; the smoother mandrel bends all appear to scream horse power. But a loss during the entire Rev range? Total BS. These people did not pay attention to one of the basics of automotive exhaust work. AF
So what your saying is leave the bolts on’s alone and Twin turbo it 😁
Awesome video keep it up
Thank you for your info real good and lets wait for american raging headers always prefer them over kooks
Aren't people buying headers just for the sound upgrade at this point lol. I'd sacrifice some hp to make this car sound like it should.
Hopefully they fix their product.
Kooks.... or krooks?
To Parrot what has been already said ...
Disappointing ... just because it is louder does not mean more HP ...
Corvette Direct only saw a 5hp increase with the green cats and headers from kooks... 🤔🤐💣
Maybe the cats are worth +10 HP, and the headers are worth -5HP, giving a net gain of +5.
just saying i think the tubes order it s not the same as the original GM ... not just the 2.5 flange diameter problem
welll damn, thanks for letting the people know. fucking public servant out here.
No suprise the headers lost power...
Cats and an exhaust seem to be the way to go...
The stock header is better just looking at it. It's a really good stock header.
Better flow into a tighter collector for best N/A performance.
When I say better flow the replacement header has 4 bends vs 1.5 on the stock.
Then watch the video to see a 2.5 inch collector. 🙄
Heck if Cooks can't correct it, ceramic coat polish those headers and put them back in.
LMAO 😅 that's too funny
You should have known those headers would do nothing as GM Corvette engineers said their exhaust manifolds were practically headers and you could not improve upon the current exhaust system. And by koox coming out with a two and a half inch collector give me a break I'd sue the bastards in mean at least obviously ship them back and get your money back you're not going to get any power on the exhaust side. And no one's going to be able to crack the computer for years it will be into the z06 by then. Jeezz.
It’ll be cracked this year.
14:23 ... RONA!!!!
This isn't a relevant test until the A/F is corrected for the changes made.
maybe with a tune the headers will work ,,
No tuning available. They knew that when they released this product. Just a scam to get your cash.
I'd be pissed if I spent that kind of money and lost power and all that important heat shielding!
Oh, and the beefier OEM headers will likely outlast those Crooks headers!
Good that you are putting the Kooks Headers to the test. I've heard they say you'll gain up to 27HP. I would think they should make them to remount the heat shields. Thanks for putting them to the test. The Dyno speaks or it self. I believe high flow cats and a aftermarket lighter exhaust could make a gain in HP.
Thanks for sàviñg everyone money!¡
Looks like Emelia Hartford will lose to DDE after all after that smack talk 😂😂
Well hers included the cats, so she likely has different results
If I would seen those collector outlet diameter was almost a half inch smaller i would have packed them up sent them back aborting the project. Now your stuck with shitty headers.
Still going to do the full test. The headers are coming back off shortly for turbos so it's not a huge deal lol
What about sae net horsepower and torque?? Was it worth while.
Shit Kooks are not cheap this is a big disappointment...
emelia hartford installed the same headers ua-cam.com/video/ZV7eS4ZfBK4/v-deo.html
And got a terriffic sound out of them...why didn't he change the cats too?
Max Fly He clearly said at the beginning he was going to upgrade in stages and measure the gains at each stage!
It’s the only way to assess how much gain is being provided by each part!
@@ces69 Kooks gave him A SYSTEM!!!!!! not Just A Part!!!!...wtf...and nobody should work or film a vehicle in flipflops!!!!
Never buy kooks better american racing or awe
Have you tested the American Racing Headers?
I would be happy to do so. But check out the more recent Kooks video, they now have a two inch version that picked up great
Stock stuff is excellent
Dear CSP. Having had the factory collectors off, I am curious about one thing. Did you check the exits of the exhaust to look for any little metal or ridges that might obstruct exit and provide hot or rough spots? Same with the manifold entrances themselves. If there was any at all seen, would, "Port Matching," yield any gains? In the old days, porting and polishing often resulted in a few extra horse power (torque, I'm unsure about). This would be something as one of your subscribers that I'd really like to know about. AF (C8 VIN: 01063, built on 02/20/2020) LT2/Z51
You guys should return voice messages for customers looking to buy parts...
I'm sorry! If you don't get a hold of us on the phone you can definitely email us at sales@cspracing.com which is much less of a chance it will get dropped between the cracks. We are working on a better phone system though so that doesn't happen in the future.
Cuz you can’t toon bro
Thats a shame bro...when I saw the diameter difference between the kooks collector and also the port opening on the kooks vs stock, I Knew that was a recipe for Less not more...How stuff like that gets into production is beyond me, who the heck OK'd the dimensions on the kooks b4 mass production? alot of othet youtubers went with kooks as well with similiar results... Are there no other companies making decent headers for c8?
What was Kooks thinking?
Sales
Kooks typically make good products, but there’s no denying the engineers at GM did a great job making them. Those are serious for OEM manifolds lol
Richard holdener did testing on the new LT engine family and found that they didn't gain any performance from headers. Anyone looking to do performance mods should save their money and put towards something else. Actually saved a friend of mine from buying them and his tuner confirmed when he double checked
Can you do the same thing with a set of ARH’s?
If arh would like to send me a set I'll be happy to test. At this point though I've already spent thousands to do this test so I'm not interested in spending more lol
Those stock headers appear to be a tri-y design not 4 into 1 like the kooks. Tri-y will always outflow due to exhaust scavenging working better when the pipes match the engine timing.
Well since no one has cracked the computer, and it will not be done anytime soon this is no shock. If you can’t tune the car for aftermarket parts your wasting your money.
what about torque?
Second channel to prove these are crap. Emilia just installed her set, but didn't dyno her car.....hmm
You cats got anything around back for sale?....rolling chassis...project etc???ty.
With the C8 being such a new car, give these manufacturers some time developing these parts. Also without a tune doesn't the computer need some time to adjust to these new performance parts?
most (if not all) cars gain HP when they receive better exhaust even if no additional ecu tuning is done, and they gain even more with a tune.
you can also do ecu tuning on stock headers so that they produce more power since factory tuning is geared towards meeting regulations. don't need aftermarket headers for that gain in HP.
i don't think this is a tuning issue. 3 inch vs. 2.5 inch collector is kind of a dead giveaway.
That's Bad news for KooKs .... try using the sport cats that chevy dude used in his c8,,, i think it gave him more power...change the cats and you will have more power & more better sound
Evidently Kooks didn’t dyno this product!
Lmao
Since your stock headers are off the car I would try to bore the insides out as much as possible. (Maybe do a ceramic coating too, to keep the heat down.) And then get a high flow cat axel back exhaust set up.
I think it's more for looks than anything. They look way better in that engine bay.
What I want to see made are some equal length headers for the C8 just to really confuse people when you drive by.
Thanks for the heads up man
I am wounder the numbers from the titanium new exhaust from armatronix will be ?