I am looking for lecture free dimensions of the stock cat so i can fabricate a straight pipe for my 85 trans am because i must remove the air system to fit in my twin turbos and dont want to run the risk of plugging my cat and i dont have the money for an aftermarket cat (please dont tell me the fines are more, because i know.) So if someone could give me the dimensions of the cat or the size of pipe i would need to do this it would be very helpfull! Thanks!