How restrictive is the stock h pipe?

[blacksheep06]

My car hasn't come in yet but I was wondering how many cats are on the 06 gt and how big is the diameter of the mid pipe? I believe I read it was 2.5 " on these models with only 2 cats?

If so would shelling out for an aftermarket catted midpipe really be worth it on these cars?

 

[Kyle F]

In short no its not really.

The factory exhaust is pretty good, unless you are goign with long tubes. Then a set of High Flow Cats and new mid pipe would be excellant. Though a mid pipe on its own is like the Shorty headers. Only a few HP, and thats mainly from either removing the cats or changing to high flow.

Think CAI and a 93 Tune to start off with. THis is by far most important.