By the end of my winter break (jan. 26th) i'm going to have my cai, warpspeed y-pipe, hi-flow cat, replace the O2 sensors and custom catback exhaust (probly all at once, do the cai myself one day and then bring my car in for the exhaust work)......i know that it's hard to say exactly what i should gain from this but what estimated gains might i see from this? One other question, should i go 2.25" w/ the exhaust or 2.5"?

 

hmph........

 

2.25 is better for NA application. 2.5 is better for boosted application.

 

GO with a 7" exhaust opening!! That will let a lot of air through...

 

ummmm thanks

 

I hear that 3" was best for boosted apps.

 

alright......i'm planning to go NA so i guess I'll go with the 2.25" exhaust.....is there any difference in sound between 2.25 and 2.5"?

 

A raspy sounding exhaust. Any aftermarket muffler will make our cars sound like

Found this out the hard way

 

so your suggesting i leave the stock muffler on?