hey guy i was looking at geting a new exaust system for my car. what i was really looking to was the apexi n1. i was woundering what people think of it and how it sounds (to loud or a nice sound to it ) on more thing i would like to know is how big of piping i should do and why.

 

piping size depends on what whp your making, above 280 you should have 3"

 

If you have quite a bit of power being produced you'll probably want to go to 3" but if its your run of the mill bolt on turbo kit 2.5" piping will do just fine.

With a forced induction set up, some exhausts tend to quiet down a bit so an Apexi N1 shouldn't be too loud. (I don't think its loud to begin with!)

Also Thermal makes good parts or just go to a quality exhaust shop and have them make you a custom one.

Have fun.