i have a 05 coupe 5at, I recently had HKS hi power exhaust installed, and JWT pop charger/z-tube combo. but i haven't tuned my car, for a noob this would be fine, but i'm not interested in wasting extra horses that are just sitting under the hood, but i haven't done my homework on ecu chips and stuff like that, so anyones 2 cents would be a help....thanks

 

look into osiris and cobb.. I have a unichip and gained 9hp with the tune but I believe osiris and cobb will get u good gains

 

get a spacer too before you get your tune.

 

get more bolt on's prior to your tune

 

the plenum spacer u mean?

 

^yes and do test pipes or hfc first

 

would you say 5/16" is the best size?

 

^ yes sir.