catalytic converter, catalytic converter Options

[redceli]

im getting my exhaust system done at a shop and someone told me if i take the catalytic converter out you will loose some torque. is this true? if it is then how much horse power would a performance catalytic converter give you.....thanks

[Negative]

I understand what he said about the loss of low end power with no muffler - you do tend to loose low end torque (ie. at the launch) the more free flowing the exhaust. The lack of back pressure causes this. However the gain in upper RPM HP more than makes up for it. And let's face it - with the traction issues we have you can afford to loose a little wheel spin in favor of upper rpm HP.
These are facts - not theories. The reason everybody debates these issues is because everyone's cars, driving style and experiences cause differing opinions. I have done a lot of muffler swapping to get the range I was looking for. Also I'm a fluid and mechanical engineer so I know a little something about air flow.

To answer the question:
Get:
GT - Intake
Header
high flow cat
2.5" Catback exhaust with a free flowing muffler (really makes very little diff what brand)

ST - Idk probably the same stuff but perhaps 2.25" exhaust (just a guess)

Do this and you'll be fine - no where near 150HP though.

This post has been edited by Negative: Feb 10, 2006 - 1:02 PM