LS2 Headers Question
Thread Starter
2nd Gear
Joined: Aug 2014
Posts: 2
Likes: 0
LS2 Headers Question
Hello all,
I have been following this forum for a long time and found most of the answers I need. I have an '05 corvette z51 with Borla cat back exhaust and I'm ready for some headers. I want to put on the LG street series headers but I have a question about what I need. A friend of mine says that I should get high flow cats with it instead of no cats because the LS series engines needs the back pressure provided by the cats. Can anyone provide help in answering if this claim is true or not?
I have been following this forum for a long time and found most of the answers I need. I have an '05 corvette z51 with Borla cat back exhaust and I'm ready for some headers. I want to put on the LG street series headers but I have a question about what I need. A friend of mine says that I should get high flow cats with it instead of no cats because the LS series engines needs the back pressure provided by the cats. Can anyone provide help in answering if this claim is true or not?
Pro
Joined: Jan 2014
Posts: 631
Likes: 0
From: NEWPORT NEWS VIRGINIA
No cats will give you 5-10hp more but will also give you more exhaust smell.. I run no cats, and the smells is not bad at all .. The statement about back pressure, I have never heard of it maybe he is thinking of motorcycle exhaust.
Melting Slicks
Joined: Feb 2004
Posts: 3,307
Likes: 111
From: Tucson AZ
Back pressure is not an issue on these engines. You can run it with or without Cats.
I chose headers with high flow cats as the restriction is minimal and only near redline. The high flow cats reduce the fuel smell inside the car at stop lights.
I chose headers with high flow cats as the restriction is minimal and only near redline. The high flow cats reduce the fuel smell inside the car at stop lights.
Burning Brakes
Joined: Jul 2008
Posts: 923
Likes: 37
From: Green Bay Wisconsin
Hello all,
I have been following this forum for a long time and found most of the answers I need. I have an '05 corvette z51 with Borla cat back exhaust and I'm ready for some headers. I want to put on the LG street series headers but I have a question about what I need. A friend of mine says that I should get high flow cats with it instead of no cats because the LS series engines needs the back pressure provided by the cats. Can anyone provide help in answering if this claim is true or not?
I have been following this forum for a long time and found most of the answers I need. I have an '05 corvette z51 with Borla cat back exhaust and I'm ready for some headers. I want to put on the LG street series headers but I have a question about what I need. A friend of mine says that I should get high flow cats with it instead of no cats because the LS series engines needs the back pressure provided by the cats. Can anyone provide help in answering if this claim is true or not?
Alittle backpressure at low RPMs helps you and then hurts you at high RPMs. No backpressure hurts you at low RPM and helps you at the high RPMs.
If you get caught without catalytic converters the fine can be up to $2500. That's an expensive way to gain less than 5hp.
Good Luck,
Douglas in Green Bay
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Drifting
Joined: Feb 2012
Posts: 1,592
Likes: 95
From: Warwick Rhode Island
I have non catted obx and borla s type 2's, i wanted loud and the hi flow cats would have killed some of the noise. I went back-and-forth about getting cats are not getting cats because I don't want to smell the exhaust, but I got to be honest the smell is not bad at all and I am very happy with what I did
Drifting
Joined: Feb 2012
Posts: 1,592
Likes: 95
From: Warwick Rhode Island
Also if you don't want to tell in the car immediately you can always get spark plug nonfilers and drill them out and you won't have any lights from the o2 sensors. I have a 1999 Honda Accord that I did the spark plug non-filer trick on after I gutted the cat to eliminate an issue. 8 months and many miles no check engine light
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
LS2 Headers Question
Originally Posted by black.z51.c6
Also if you don't want to tell in the car immediately you can always get spark plug nonfilers and drill them out and you won't have any lights from the o2 sensors. I have a 1999 Honda Accord that I did the spark plug non-filer trick on after I gutted the cat to eliminate an issue. 8 months and many miles no check engine light
Regardless, the code won't hurt anything until it can be tuned out.
Drifting
Joined: Feb 2012
Posts: 1,592
Likes: 95
From: Warwick Rhode Island