first off aluminums major downfall is thermal dynamics, the exhaust gets colds too fast, so you have to be very mindfull that your exhaust velocity will try to slow as it exits the car. going to big on aluminum is a bad idea... same concept, you cant keep the exhaust hot enough. i'd say 4" on a honda is a big no-no. and absolutly no offence lembo, but the point of this is to showcase my work, was hoping at the JJC meet, and you car isnt exactly out to showcase parts much... i will keep you in mind though