i dynoed my car with 2.25 all straight piping with a CTR exhaust. my tuner said it'll be better if my car has an exhaust but i don't want to spend anymore money. but i want to free up some hp. my friend is hooking me up with his rsr exmag which is 2.25. would that be ok to run on or should i just save up for 3"?

 

kteller 3 inch piping. Its cheap and its 3 inch. I had 2.25, and itll just rob you of horsepower your car should be making.

 

you can always run open downpipe, but since you are in cali, yea just save up for 2.5" or 3" exhaust