No cat?
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
This is an interesting question... on the L98, the exhaust is very restrictive.
If it was me, and could do the ultimate L98 exhaust, I would go with LTs, bullet cats off the collector, x-pipe, then back to mufflers, more then likely, magnaflow.
That would keep the air clean and pick up somewhere north of 60hp.
I am a huge fan of cats... gutting them creates large chambers with no control for the air flow... and lowers back pressure which would effect performance.
If you live in such a state, the above would be seriously kick ***.
If it was me, and could do the ultimate L98 exhaust, I would go with LTs, bullet cats off the collector, x-pipe, then back to mufflers, more then likely, magnaflow.
That would keep the air clean and pick up somewhere north of 60hp.
I am a huge fan of cats... gutting them creates large chambers with no control for the air flow... and lowers back pressure which would effect performance.
If you live in such a state, the above would be seriously kick ***.
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
with bogus...There is a lot of power to be had by ditching the entire L98's exhaust...
To answer you're question, I dont know of anyone who dyno'd their car before and after removing the cat. All I can tell you is mine had a noticeable difference.
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
A "gutted" cat can actually cause a performance loss and some really funky exhaust noises. If you're going to ditch the cat, do it right by removing it and putting a straight pipe in it's place to effectively remove a source of exhaust turbulence. If you want to keep it clean install a high flow cat for your car.
If it's an L98 a set of Hooker 2149 headers with dual bullet cats into a nice 2.5" or better cat-back would flow all you'd ever need and keep the air clean too, it would even retain the provisions for your air pump / etc. 2151's with no cats will give you the absolute best in performance and looks because they don't have AIR provisions. Technically though this setup is illegal.
If it's an L98 a set of Hooker 2149 headers with dual bullet cats into a nice 2.5" or better cat-back would flow all you'd ever need and keep the air clean too, it would even retain the provisions for your air pump / etc. 2151's with no cats will give you the absolute best in performance and looks because they don't have AIR provisions. Technically though this setup is illegal.
