I am running a cat-back exhaust on my 305tbi and i was wondering if I should gut out my cat or just get rid of it all together and put in a test pipe ? whats the horsepower gain..... if any at all. also how much louder will it make my exhuast? thanks !

 

Get rid of 305 TBI first then worry about horsepower gains and sound of the exhaust.

 

It will be louder with either, you'll get less popping from a test pipe than a gutted cat. Is that legal in NH though? However, the power loss from a new high flow cat vs a test pipe is going to be negligeable...

 

UR AN A**HOLE

 

Cats are very restrictive, you'll free up alot of power no matter what you do to it. Im not sure what a test pipe is, but you alos may want to investigate how your car will act with less back pressure. A freind of mine has a F-150 i beleive its EFI not TBI but hes running into probelms because his O2 sensor is no longer reading within a range of a present cat since he now has straight exhuast.

Have you looked into one of those aftermarket high flow cats?

 

You should know...YOU ARE ONE.

 

i cant afford anything else right now. My exhaust already sounds amazing and is loud enough thats why i was wondering how much louder it would make it. NH laws arent nearley as strict. Either way I know some people who will put a sticker on my car even if i didnt have an exhaust system.

i know my car doesnt have any ***** but it still smokes the tires, handles decent, and looks good. iam happy with it