i went from 4" axle dump with 8" tip to 5" axle dump with 10" tip on my lmm, and holy shit it is so much louder. you cant beat the sound of an axle dumped diesel, it sounds incredible
Peter Jones you can most definitely beat the sound of a axle dump diesel. A factory exit 5 or hood stack sounds much better. Axle dumps have to much echo under the bed and in the cab.
I like the 4” myself, a bit raspier and higher pitch turbo whistle, which I why I’ll eventually be trying some 4” duals on my LBZ sometime here soon on my channel.... but first I’m looking at Bedliner paint job so that corrosion issues don’t happen!
Both sound awesome. Kinda like the deeper sound of the 5 inch. I have a 4 on my truck and I love the sound when I get into the higher rpms. Want to do a 5 inch though. And I like the smooth look of the led tail lights better than the stock. The smoked loon is way better then the red but I prefer the led. IMO
I think they both sound great In different ways. Raspy 4 inch. Deep 5 inch. The 4 inch is definitely louder. But smaller exhaust is louder always even on gas pickups if the motor is the same and the exhaust identical besides diameter smaller is always louder. The 5 inch has a nice deep sound if your looking for that
4 inch has more of a pur whereas 5 inch is a bassy growl. Video only does such much justice though. Very interesting video. This is a common topic amongst cummins owners. "Go big or go home", and "Bigger is better" are oftened chanted around this discussion. I believe 3rd gens sound best with 4" especially matted to a 6 speed. Unless they have the 2nd gen manifold with a large single turbo, like my 04.5 6 speed, then 5 inch is better. Sounds beautiful and one of the loudest trucks in SE PA.
I like 4inch personally. All depends on what you like but I’ve read several studies and done several tunes with guys that do this all the time and we’ve pretty much discovered that 5inch is overkill on anything less than 800hp. If anything it knocks your numbers down a bit until you hit that hp mark.
Don't switch, the main difference in the noise is the tune. I have the 5" on my truck and before I tuned it the turbo whistle was louder but then I got the PPEI rumble tune.
Unless you're running 500+ hp 4" is more then enough, you lose some bottom end torque with a 5" in the sub 500s but gain a little top end. It's all on what you use the truck for but imo, 4" is sufficient enough
Honestly I think 4 inch is perfect. It gives that real clean sound on the LB7 but not super loud. The 5 inch sounds about the same but it’s really amplified. It’s a little too loud for my like but no matter what anyone says it all comes down to personal preference. Unless your like 800 horse then 5 would be better lol
I have the same tail lights on my 04’ Z71. Looks sick on my truck being black and white themed. Only problem is they do crack easily and for some reason the bulbs didn’t sit in them very snug once I locked them in. Other than that I love them. I believe I like the 5” exhaust better. It’s a tough decision though. Lol. Both sound sick
I think 5" sounds better. Im running 5" straight pipe, axle dumped on mine. As far as the stack, I dig the single short stack look, just don't go above 40" tall I think lol
It’s silly how people including shops make a big deal about EGR deletes which is not really a big deal. The fine is $5000 but I’ve never heard of anyone getting fined but I’m sure it’s happened. My point is a cop doesn’t know diesels usually and wouldn’t even know where the EGR is if the hood was popped. As far as an inspection you just find a shop that doesn’t care about it
I like the factory lights better. Don't like the black. Probably draws the cops more. Also darker and draws less attention which is what tail lights are for. I would hate to be plowed into from the back by a millineal texting cause they can't see the tail lights as well. Exhaust sounds good.
It does when your driving heavy I mean 12k 5th wheel on the rear kicking it up a hill kind of heavy. Both 4” and 5” with no muffler is annoying. 4” with muffler is somewhat bearable.
You sir was the reason I bought my lly duramax I couldn’t ask for better truck I bought 2004 2500 duramax I’ve always had Chevy trucks but never duramax
4" does sound great... I personally like the sound of the 5" better and if all you're going for is sound - stick with the 4" and just delete the cat as you said.. But if if you're looking for performance, you'll want the 5" it as it lets the engine breath better and is a horsepower /torque increase up from the 4" exhaust
To those that may not know, Diesel engines operate off of Compression. Although 5 inch Exhaust sounds deeper you will lose lower end torque than with the 4 inch Exhaust. I've had 4 and 5 inch setups and there isn't enough difference between EGT temps to spend more money.
I'm running a 5 in MagnaFlow exhaust no Muffler to a 7-inch tip with 3 inch downpipe wehrli custom Fab 3 inch high flow intake with y bridge and I'm pretty sure it's a hundred and 20 horsepower tune Overstock and a fast 165 pump and my truck sounds completely different then your 5 inch exhaust also mines a lmm
I prefer the factory taillights over the smoked. I think the smoked ones look cheap. If his truck was black I think it would look better but I think it looks a bit tryhardish.
Your channel has inspired me to start building my 05 lly. I check your channel when working on it, So thank you! One question I recently installed cold air intake, down pipe 5inch exhaust and fass 95 lift pump. Will the truck be running correctly with that being done and no tunes yet? Planning on deleting and tuning in the future. Thanks
Hey I’m not sure what your name is as I’m new to watching your videos. But you seem quite knowledgeable about the gm diesels. I have a LBZ completely stock. I’m looking to get better fuel economy. I don’t care about power as it has plenty of power from the factory. I don’t want to spend a ton of money on upgrades ideally would like to get around 20mpg. Mostly I town driving is what I do. Light towing. Dump trailer and Building materials on occasion. Any advise would be appreciated.
7:10 your welcome
That 5” is definitely the sound I’m wanting for mine. Thanks for helping me choose. Lol
5” all the way. Not bias or anything 😬
Haha love the vids man
Yea but 4” is louder. Not from the video but the guy who did my dads truck said 4 is louder than 5. But 5 is deeper
Digging deep into these old videos. Considering getting rid of my 7.3 for a lb7
I prefer 4, you can hear the turbo whistle a lot clearer. I think the 5 just looks better
I like the 4inch but everyone has there own thing. They both sound really good. I love the way my 4 inch straight pipe sounds on my lb7
4” is pretty good but, the 5” deep tone kicks ass 👍
i went from 4" axle dump with 8" tip to 5" axle dump with 10" tip on my lmm, and holy shit it is so much louder. you cant beat the sound of an axle dumped diesel, it sounds incredible
Peter Jones you can most definitely beat the sound of a axle dump diesel. A factory exit 5 or hood stack sounds much better. Axle dumps have to much echo under the bed and in the cab.
Video is titled about exhaust comparison and does a tail light install like jeez dude waste my time much
The classic duramax scream has to be the best diesel exhaust note
Basically do you want more turbo or more rumble. Personal preference. I like the 4"
I like the 4" exhaust , smaller diameters always sound throaty and snappier.
Better mpg's and more low end power too.
I like the 4” myself, a bit raspier and higher pitch turbo whistle, which I why I’ll eventually be trying some 4” duals on my LBZ sometime here soon on my channel.... but first I’m looking at Bedliner paint job so that corrosion issues don’t happen!
Rustbelt Mechanic drop
Did you ever make this video I can’t seem to find it
@@trentonbutler4067 no I ended up keeping 4” then eventually to 5” after going to compound turbos
I love the deeper sound of 5” exhaust
Both sound awesome. Kinda like the deeper sound of the 5 inch. I have a 4 on my truck and I love the sound when I get into the higher rpms. Want to do a 5 inch though. And I like the smooth look of the led tail lights better than the stock. The smoked loon is way better then the red but I prefer the led. IMO
5 inch!!!
I think they both sound great In different ways. Raspy 4 inch. Deep 5 inch. The 4 inch is definitely louder. But smaller exhaust is louder always even on gas pickups if the motor is the same and the exhaust identical besides diameter smaller is always louder. The 5 inch has a nice deep sound if your looking for that
If you want deeper sound, and already have a 4 inch, get a 6 inch tip. Cut the exhaust to where only 3 or 4 inches goes into the tip and weld it on
4 inch has more of a pur whereas 5 inch is a bassy growl. Video only does such much justice though.
Very interesting video. This is a common topic amongst cummins owners. "Go big or go home", and "Bigger is better" are oftened chanted around this discussion. I believe 3rd gens sound best with 4" especially matted to a 6 speed. Unless they have the 2nd gen manifold with a large single turbo, like my 04.5 6 speed, then 5 inch is better. Sounds beautiful and one of the loudest trucks in SE PA.
5” with an 8” tip 🤙🏼. 5” straight pipe give a good rumble and the 8” tip also gives off the nice whistle
4inch. Should let trucks run for a bit after reving the piss out of them. Let coolant circulate cool things down
Chill😂
I like 4inch personally. All depends on what you like but I’ve read several studies and done several tunes with guys that do this all the time and we’ve pretty much discovered that 5inch is overkill on anything less than 800hp. If anything it knocks your numbers down a bit until you hit that hp mark.
Don't switch, the main difference in the noise is the tune. I have the 5" on my truck and before I tuned it the turbo whistle was louder but then I got the PPEI rumble tune.
Unless you're running 500+ hp 4" is more then enough, you lose some bottom end torque with a 5" in the sub 500s but gain a little top end. It's all on what you use the truck for but imo, 4" is sufficient enough
Wait until you pass by a bored cop with those smoked tails. I’ve been pulled over like 3 or 4 times about mine no ticket though lol
First time watching one of your videos. Not too often you come across folks from Michigan! GO BLUE!
Go bucks. Fuck Michigan bitch boy
Reppin Cheboygan Michigan
Blends perfect with all the dirt and grime on the truck
Size matters! 5" sounds so much better and is the only way 2 go if u love the turbo whistle
Honestly I think 4 inch is perfect. It gives that real clean sound on the LB7 but not super loud. The 5 inch sounds about the same but it’s really amplified. It’s a little too loud for my like but no matter what anyone says it all comes down to personal preference. Unless your like 800 horse then 5 would be better lol
If you pull trailers....4 inch
If you don’t 5.
Best of both worlds is 4” with a 6” tip
I have the same tail lights on my 04’ Z71. Looks sick on my truck being black and white themed. Only problem is they do crack easily and for some reason the bulbs didn’t sit in them very snug once I locked them in. Other than that I love them. I believe I like the 5” exhaust better. It’s a tough decision though. Lol. Both sound sick
I think 5" sounds better. Im running 5" straight pipe, axle dumped on mine. As far as the stack, I dig the single short stack look, just don't go above 40" tall I think lol
The cross sectional area of the 5" is almost 60% greater than the 4" exhaust. Much better flow.
I run 5 inch on my sounds amazing
5 inch for sure! Much deeper
It’s silly how people including shops make a big deal about EGR deletes which is not really a big deal. The fine is $5000 but I’ve never heard of anyone getting fined but I’m sure it’s happened. My point is a cop doesn’t know diesels usually and wouldn’t even know where the EGR is if the hood was popped. As far as an inspection you just find a shop that doesn’t care about it
I do prefer the sound of the 4 inch, which is why I just installed a 4 inch stainless straight pipe system on my LB7.
I have an lb7 and rebuilt it from the ground up. I think the 4 sounds way better. But I think mine does haba
5 all day
I like the factory lights better. Don't like the black. Probably draws the cops more.
Also darker and draws less attention which is what tail lights are for. I would hate to be plowed into from the back by a millineal texting cause they can't see the tail lights as well.
Exhaust sounds good.
Those blasted millineals!!
5” for sure. More of a deep turbo sound
5", love it on my LLY and LMM
Did you have to remove the spare for the lmm with the 5 "??
More throat but when it's in the zone rpm pull the 5 sounds great netural revs u don't get the full affect
Their both great, I've had the 4" on an lb7, and now have a 5" on my lly.
It does when your driving heavy I mean 12k 5th wheel on the rear kicking it up a hill kind of heavy. Both 4” and 5” with no muffler is annoying. 4” with muffler is somewhat bearable.
Definitely noticeable sound difference and a better sound at that
You sir was the reason I bought my lly duramax I couldn’t ask for better truck I bought 2004 2500 duramax I’ve always had Chevy trucks but never duramax
I prefer the stock tails untinted
5 inch all the way! Nice trucks by the way! I just subscribed cant wait to see more of your videos
That's awesome you're from Michigan! Me too! (Southwest)
Me too... Benton harbor coloma area
Yeah 4 inch better sound , but les restriction with your 5 inch still sound good 💪
4" does sound great... I personally like the sound of the 5" better and if all you're going for is sound - stick with the 4" and just delete the cat as you said.. But if if you're looking for performance, you'll want the 5" it as it lets the engine breath better and is a horsepower /torque increase up from the 4" exhaust
Theres not enough restriction for performance
like and got 5 inch, tip makes big difference too. put a 5 to 7 inch on mine, holy difference!
5 all the way
Exhausts comparison start at @7:10
I just got 4" exhaust with no mufflera and it sounds awesome
To those that may not know, Diesel engines operate off of Compression. Although 5 inch Exhaust sounds deeper you will lose lower end torque than with the 4 inch Exhaust. I've had 4 and 5 inch setups and there isn't enough difference between EGT temps to spend more money.
5" 💯
I’m gonna go with 5 inch I have a factory exhaust right now but I love the rumble!
Other wise 4 is great
Also check out 3 inch down pipe and the driver side manifold upgrade made a big difference in my lbz
I'm running a 5 in MagnaFlow exhaust no Muffler to a 7-inch tip with 3 inch downpipe wehrli custom Fab 3 inch high flow intake with y bridge and I'm pretty sure it's a hundred and 20 horsepower tune Overstock and a fast 165 pump and my truck sounds completely different then your 5 inch exhaust also mines a lmm
These dudes really use their trucks for what they're made for..
+Warren Albuna definitely
Was waiting to find this kind of comment, the truth has been spoken
5 inch for sure
5" love mine
Had a 4” Mbrp to 8” tip on my lbz and it sounded awesome
Keep the 5inc bro!
That stack looks awesome
I prefer the factory taillights over the smoked. I think the smoked ones look cheap. If his truck was black I think it would look better but I think it looks a bit tryhardish.
I got 4 inch. Wish id of got the 5
5 inch is deeper. But length of pipe makes a difference too. I have a single cab 4 inch and it screams like a stuck pig
Definitely 5".. Magnaflow true 5" !!
I know my LBZ sounded different with different tunes ,I had Idaho Rob now I have Danville .
In person is always different of course so its hard to judge on video
I gotta go with 5' tip💯💪
I have a 4" cat back right now but just ordered a 5" down pipe back
4 is ik but that 5 was jaw dropping
5 hands down
5in is louder. It also depends which Duramax you have.... if you have the lml defiantly get the 5in
5” for cooler egts ;) hahahaha
All jokes aside I have 5” and I love it.
I've never heard a diesel pop like yours did on that last rev 😯
+mark williams my LMM did that before I’m sure it’s not healthy
He just red lined it
If you're going to be stacks on your Silverado I would do dual 7-inch bull haulers
Your channel has inspired me to start building my 05 lly. I check your channel when working on it, So thank you! One question I recently installed cold air intake, down pipe 5inch exhaust and fass 95 lift pump. Will the truck be running correctly with that being done and no tunes yet? Planning on deleting and tuning in the future. Thanks
Jay Brain your truck is pre emissions meaning no regen so your all good.
boost lord awesome thank you!
Still has an egr just no dpf
I think the 4 is better with rpm, kinda raps out like a 6.0 ps but the 5 sounds better at idle
I have 5 inch with 8 inch tip let me know if you wanna hook up to hear it. I love it!!
Asking for rust trouble on the red truck 😦 Those stick on panels ! Looks good though.
Bigger the better
Definitely 5” with ppe manifolds!
I’m in favor of the 4” sound. It does sound better than the 5”. I still have the 4” on my 04 Duramax .
I have a 4 stock rn with muffler delete, but I plan to get a 5
headsmashgamer1 I’ll buy it from you. Where you at?
Go up past the roof line w the stack or I’ll basically paint the back window and roof black w soot.
I think the 4” sounds a lot better than the 5”. For sure.
Light you mentioned..is the D.R.L
.stay with the 5"..
4 inch it just has that sound that you know yep that’s a dmax
Having a 5 inch exhaust is a lot better than having a 4 inch exhaust exhaust temperature to decrease faster
I’m a fan of the single stack
I'd say stick with the 5"
I’d prefer the 5 cause the turbo is just as loud and it’s deeper
Hey I’m not sure what your name is as I’m new to watching your videos. But you seem quite knowledgeable about the gm diesels. I have a LBZ completely stock. I’m looking to get better fuel economy. I don’t care about power as it has plenty of power from the factory. I don’t want to spend a ton of money on upgrades ideally would like to get around 20mpg. Mostly I town driving is what I do. Light towing. Dump trailer and Building materials on occasion. Any advise would be appreciated.
5” sounds better at idle 4” sounds better in higher rpm
4" to 8" tip is always better