hey guys, im buying a set of cutouts for my 305 91 z, and i dont know what size to get on my stock exhaust pipe. i was pretty positive it was 2 1/4 but anyone think different?

2.5

thanks a bunch i almost bought the 2.25

might want to get a 3" and some reducers in case you want to up the exh. size in the future

i thought about that too but ill eventually get headers and redo everything good point tho

If you get headers, buy the 3" model now. W/ headers you want a good 3" single pipe to the rear anyway. Even on a 5.0

im just getting the cutouts for now and didnt know wat the stock pipe size was and which size cutout to get but thanks for the future info

When i bought my Trans Am it had installed a 3in single pipe going to the back is that supposed to be better then dual pipes?

What is the purpose of a cutout?

better exhaust flow before the cat and muffler, soem torque, mainly loudness

i measured my pipe though and it was 2 and a quarter, so im just gonna get two and a quarter cutout

I guess mainly for the noise. It doesn't do much for a stock car. It's not necessary at all on a street car. Hell my car made 255whp with just a full exhaust system in my sig when the engine was bone stock. Somebody is not doing something right.

i changed out my stock exhaust manifolds and got some new ones a few years ago but the pipe hasnt changed going to the cat so it should sound good enough