Question about gutting my cats...
05-27-2009, 12:42 PM
#11
3rd Gear Member
Join Date: Oct 2006
Location: Spring, TX
Posts: 816
If you gut your cats and the rear O2 sensors are turned on, it WILL throw a code and illuminate the MIL. It will also cause unpredictable changes in your exhaust system resonances that could either help you or hurt you (probably depending on rpm and exhaust gas volume). I would expect that the sound would vary with rpm somewhat more than it does.
Norm
Norm
But we haven't had any issues with resonance after the cats have been "gutted"
*knock on wood*
05-27-2009, 07:21 PM
#15
3rd Gear Member
Join Date: Oct 2006
Location: Spring, TX
Posts: 816
05-27-2009, 08:31 PM
#16
1st Gear Member
Join Date: Jun 2006
Location: California
Posts: 140
From the engine block to the mufflers our car's are restricted, there's not doubt about that. Cats are cats (with some more restrictive than others) but to compare an I-4 or anything else to that matter to our engine would be apples to oranges. Not to make ours sound (no pun intended) godly, but every engine is different. By converting to an O/R mid pipe our cars do pick up some HP.
05-27-2009, 09:01 PM
#17
3rd Gear Member
Join Date: Oct 2006
Location: Spring, TX
Posts: 816
From the engine block to the mufflers our car's are restricted, there's not doubt about that. Cats are cats (with some more restrictive than others) but to compare an I-4 or anything else to that matter to our engine would be apples to oranges. Not to make ours sound (no pun intended) godly, but every engine is different. By converting to an O/R mid pipe our cars do pick up some HP.
lol
05-28-2009, 09:49 AM
#19
4th Gear Member
Join Date: Feb 2008
Location: NJ
Posts: 1,496
[QUOTE=Topless06;6235637]i thought putting a o/r pipe on makes the exhaust raspy. is this correct?
It will be raspy. Even an O/R H or prochamber will be rapsy. It won't be as raspy as an O/R X but will definitely be more raspy than the stock H.
It makes power because the turbo produces 10psi. Just because the stock exhaust is restricted compared to an O/R setup doesn't mean it can't make power. However, an O/R exhaust setup could make more power than the stock catted setup, especially in a turbo application
It will be raspy. Even an O/R H or prochamber will be rapsy. It won't be as raspy as an O/R X but will definitely be more raspy than the stock H.
It makes power because the turbo produces 10psi. Just because the stock exhaust is restricted compared to an O/R setup doesn't mean it can't make power. However, an O/R exhaust setup could make more power than the stock catted setup, especially in a turbo application
05-28-2009, 10:41 AM
#20
3rd Gear Member
Join Date: Oct 2006
Location: Spring, TX
Posts: 816
[QUOTE=VistaGT;6237336]
In a turbo application yes, but unless you just want a louder exhaust note, I don't see it making sense to run an O/R pipe in a N/A application...especially on these cars.
i thought putting a o/r pipe on makes the exhaust raspy. is this correct?
It will be raspy. Even an O/R H or prochamber will be rapsy. It won't be as raspy as an O/R X but will definitely be more raspy than the stock H.
It makes power because the turbo produces 10psi. Just because the stock exhaust is restricted compared to an O/R setup doesn't mean it can't make power. However, an O/R exhaust setup could make more power than the stock catted setup, especially in a turbo application
It will be raspy. Even an O/R H or prochamber will be rapsy. It won't be as raspy as an O/R X but will definitely be more raspy than the stock H.
It makes power because the turbo produces 10psi. Just because the stock exhaust is restricted compared to an O/R setup doesn't mean it can't make power. However, an O/R exhaust setup could make more power than the stock catted setup, especially in a turbo application