exhaust ?
 

what type of exhaust setup should i use with the j-spec gt-x engine? Is there a certain amount of backpressure needed, or could a straight pipe work just as well?
thanks
ride on and slide on, sideways that is

No backpressure.
Most people say 2.5'' to 3'' exhaust is good for the GTX. If you want to run a straight pipe, go for it, but I'm sure you know that it'll be both loud as fuck and illegal. If its not a street car, do whatever you like with the exhaust.

3" for a turbo system I say. Please run SOME sort of muffler if you will be on the street. It's loud and obnoxious and gives us ricers a bad name.. hehe :D