For those asking he removed the 2 rear cats on a dual exhaust with 4 cats, the downstream o2 sensor is placed before the rear cats meaning it will not throw a check engine light to remove the 2 rear cats. Pair that with a drop in K&N air filter or even a good CAI and it brings these cars to life.
these cars have 4 cats, 2 on each header. if you just delete the secondaries there will be no codes as there are no 02 sensors there but if you delete all 4 there will be.
@@briankrasne3518 I live in IL to just make sure there's no check engine lights aftet you delete the 2nd cats. And be careful of the o2 sensors. If your car throws a code just get a OBD2 reader and delete the code and you should be fine I didnf have troubles when I deleted my 2nd cats but my friends vic kept throwing a code so he just deleted it before he went to go pass smog and he passed
It depends on the type and construction of the muffler. Most OEM mufflers are restrictive -- and some types (like glasspacks) are more restrictive than others. Example: Some glasspacks have a center tube that has LOUVERS that give more restriction in one direction than the other. That type is "directional". No Bueno !! I use and recommend the MAGNAFLOW Glasspacks, because they DON'T have Louvers protruding into the exhaust-gas flow = more power AND better fuel economy. Most importantly, DO NOT remove the Catalytic Converters. There is NO GOOD REASON for breaking Federal Law OR for polluting our air.
It's LOUD inside -- but the worst part is the severe DRONING on the open highway. Cat removal is all-ways a bad idea, but punks and dummies keep doing it anyways. Ya can't fix stupid. 😁
Which one gives me better gas mileage and HP? Delete all 4 cats? Straight pipe? Catback system? Headers? Wt heck its confusing. Im mainly looking to save gas and HP. And if sound comes with this so be it.
@@miamimagicians " Glass Pack" is a type of muffler that features woven FibreGlas packing, wrapped around a perforated center tube, and covered with a bullet-shaped steel body. Glasspax are cheaper and generally longer-lasting than OEMs or those expensive (but popular) FlowMasters.
For those asking he removed the 2 rear cats on a dual exhaust with 4 cats, the downstream o2 sensor is placed before the rear cats meaning it will not throw a check engine light to remove the 2 rear cats. Pair that with a drop in K&N air filter or even a good CAI and it brings these cars to life.
Blows my mind how many people think they are called Cadillac converters 🤦♂️
New subscriber here! The neighbor walked by starring so angrily like "what are these boys up to now?" Hahaha
You know that old man was thinking, "well there goes my nap time".
😅 hell yeah
Got a question bro , I got a 2009 grand marquis and was told these cars have 4 cats is that true
Yes
Theres 4 cats
2 pre cats and 2 rear cats, the rear cats are right after the o2 sensor
MrWeathers17 so cutting rear cats off won’t cause engine light?
@@DownShiftDrew nope
MrWeathers17 bet
They always put extra parts on cars that you don't need. 😆
They forgot to say hold my beer and watch this !
So this will not cause check engine light!
Why the whistling noise? Sounds absolutely terrible... wanna do this to my grand marquis but that sound is a huge turn off
Cus he unplugged the vacuum line
That whisling noise was there from the start , its not caused by the the cat delete
It happens when the weather is too humid
Mine random made that noise for 2 minutes only on a morning startup. Not sure what it was yet
Might want to think about some new tires too.
If you delete cats, won’t there be codes thrown? Like o2?
these cars have 4 cats, 2 on each header. if you just delete the secondaries there will be no codes as there are no 02 sensors there but if you delete all 4 there will be.
If I do this to my 03 grand marquis will it still pass the emissions!
Depends were you live
The secondary cats do not cause a check engine light code.
I live in Illinois
@@briankrasne3518 I live in IL to just make sure there's no check engine lights aftet you delete the 2nd cats. And be careful of the o2 sensors. If your car throws a code just get a OBD2 reader and delete the code and you should be fine I didnf have troubles when I deleted my 2nd cats but my friends vic kept throwing a code so he just deleted it before he went to go pass smog and he passed
@@lastone6104 car show this weekend Sunday at my dealership
Some Panther platform guys are going to be there 9 to noon
Probably a dumb question but a muffler is a hp restrictor as well, right? Just recently deleted mine on my 97 MGM
It depends on the type and construction of the muffler. Most OEM mufflers are restrictive -- and some types (like glasspacks) are more restrictive than others.
Example: Some glasspacks have a center tube that has LOUVERS that give more restriction in one direction than the other. That type is "directional". No Bueno !!
I use and recommend the MAGNAFLOW Glasspacks, because they DON'T have Louvers protruding into the exhaust-gas flow = more power AND better fuel economy.
Most importantly, DO NOT remove the Catalytic Converters.
There is NO GOOD REASON for breaking Federal Law OR for polluting our air.
How loud is it in the inside
I have my marquis done the same way. It’s fucking loud lol
It's LOUD inside -- but the worst part is the severe DRONING on the open highway.
Cat removal is all-ways a bad idea, but punks and dummies keep doing it anyways.
Ya can't fix stupid. 😁
Which one gives me better gas mileage and HP? Delete all 4 cats? Straight pipe? Catback system? Headers? Wt heck its confusing. Im mainly looking to save gas and HP. And if sound comes with this so be it.
Take all four out and run dual glass packs
What is a glass pack?
@@miamimagicians 😂
@@miamimagicians
" Glass Pack" is a type of muffler that features woven FibreGlas packing, wrapped around a perforated center tube, and covered with a bullet-shaped steel body.
Glasspax are cheaper and generally longer-lasting than OEMs or those expensive (but popular) FlowMasters.
Mine looks exactly like this 😂. Wheels and all 🤣
How loud is that on the inside
Not loud but drone while driving is brutal
How does deleting affect the car and what does it do to the mpg?
More hp better mpg.
You just ruined a beautiful car
Lmao someone's sad
@@nessabush1986 Yeah, and the catalytic converter removers are STUPID !!
@@SlikLizrd gonna cry?
Bro wdym
He made it better
I live in California but still did lol
Just did this to mine sounds like total shit lol
Lol!.. Damn, I'm glad they didn't jump off a bridge 🍺
I put some dump pipes that go back a few feet and it sounds much much better.
Those are worth 330 dollars
No they aren’t
Doing this did it thow check engine light
Why did you unplug that pump
It’s a vacuum line, it creates the illusion of a aftermarket camshaft
Don't do it big mistake
Why is that
@@abwolfsto6039 Because it's too loud (85 db is legal) -- and cat removal is against FEDERAL law.
@@SlikLizrdcrown vics and mercs have 4 cats
nice car but bro it sounds like a garbage truck...shoudl have left it stock and classy, its not a chevy!
Boomer
Boomer
Gentle advocat 26
☺
Sounds like shit! Like an old car with a hole in the manifold
Boomer
YEP. Sounds really bad. It's a cryin' shame that so many people just NEVER GROW UP, and they never seem to learn that NOISE benefits NOBODY.
Boomer