eveuntually i will be going turbo but i dont have to money right now. i only have enough for exhaust and a N20 kit. my question is will running a 3" catback on my gsr kill all of my low end or is it not that noticable? or should i run a 2.75 i would only be running around 6-8psi when i get my turbo.

 

3 inch exhaust on a FI car is a plus. However on a NA car it is a negative.

 

on N/A you will have really bad low end

 

whats a good size then for a n/a car. 2.5 or 2.75

 

2.5" is fine for even a high HP NA car.