[Homepuff]

what is the diameter of your Stock exhaust system? I am looking to get a test pipe and need to know how big

 

[kuruma]

Mine is 2.25 all the way. I've got a 91 NA Z16 thoughIf you've got the TT it could be larger

 

[defgh1]

Turbo is 2.5".

 

[225ripped]

Homepuff,
i have stock exhaust (2.5'' i think) and a 3'' test pipe, just get the gaskets and you should be fine

 

[AgtBlank]

you need a 2.5 test pipe. The stock exhaust opens up to 3" back before the mufflers