would going from a stock 2.5"muffler to a performance 2.5"muffler and gutting the cat open up much horse power the mid pipe is 3" too.

 

Are you referring to the stock muffler that came on the car? Then yes, an aftermarket one will flow a lot better, some more than others. Gutting a cat will gain a couple HP, but nothing a hi-flo one can't match almost equally.

 

performance cat back would give quite a bit more flow then the stock system

also by going with an exhaust each mod you do will have a bigger effect then it would with the stock exhaust


and if you do not have smog I would say go with a straight pipe rather then a gutted cat.they will give a lot better flow and IMHO sound better

 

He said he already has a 3" I pipe, so no need for a cat-back. I'd say get the Hooker Aero Chamber muffler, course I am somewhat biased, there's a sound clip in the signature. This is with a NON hi flo cat.

 

the muffler is a dynomax super turbo by the way it is suppose to flow really outstanding.:lala: