1996 trans am

i was wondering if anyone knew wat size the stock exhaust pipes are near the converter.. i was wanting to install an electric cut out. but im having trouble finding the size.. i took a string and wrapped it around the pipe and held that size to a measuring tape.. it was 8 inches. i took that and divided 8/3.14 which is pi.. and it gave me 2.54777 so i would assume the pipe is a 2.5" pipe.. a fellow on hpt says the trans am came with stock 2.75 " pipes.. and he is pretty firm on that beleif. i dont know why someone woulda have changed it from factory " 2.75" as he says.. to a 2.5.. the pipes dont even look new.. so.. ( im not the first owner) if anyone knows anything about this stuff let me know..

 

Your friend is correct.

If the Y-pipe appears to be partially pancaked, then you've got the factory Y-pipe.

 

Just be sure that when ordering the cutout, the given measurement is for OD (outer diameter) and not ID (inside Diameter). When I ordered my 3" Flow Tech cutout for my 3" cat-back, it was 3" ID, not OD. I did not realize this until my friend at the shop welded it in and told me after the install, but he was able to make it fit right.

 

hey guys thanks. for the info i realized what ive done.. i measured on the y pipe and not after it. from the manifolds to just after the cat IS infact 2.5" pipes. and after the y turns into one pipe it then is 2.75"pipes back to the muffler. problem solved. y adapter and cut out ordered! thanks again