Ok need some words of advice here,
I currently own a r34 gtt, which has a 3 inch front pipe, hi flow cat and 3 inch apexi cat back exhaust. I am not happy with the 3 inch exhaust as it is off a gtr and sits very low and scrapes over any little bump in the road.
So anyway I have a 3.5 inch fujitsubo cat back exhaust sitting in the garage, it does not bolt up to the cat because the flange is too big for it. I am looking to upgrade the turbo to a hypergear high flow, bigger pump and injectors etc..
Should I:
Fit the 3.5 inch cat back to the 3 inch system already on the car, will this effect sound, performance by much? Remove the 3 inch system fit the 3.5 inch cat back and have a 3.5 inch dump pipe, front pipe and hi flow cat made up/bought? Is a 3.5 inch system over kill for my setup?
Any serious advice is appreciated.