This may come off as a stupid question, but what diameter is stock si exhause exactly? Im putting a greddy evo II exhaust on my car but dont have the gaskets. Are the stock gaskets something I can use? Thanks for any help.

 

you can use the stock ones from the cat because its same size from cat->exhaust

 

Bump...is he right? Im not doubting you, I just want to know for sure it will work before I take the exhaust apart. I would just like some more peoples views to have more confidence going into this. Thanks for the reply by the way.