rocks31
Passed Driver's Ed
Wondering if anyone has any knowledge on this topic. I am looking at buying a gti exhaust for my car. I have an apr intake, usp catted test pipe and will be tuning the car next month. All along I was planning on buying an ultimate racing exhaust which is 3" in diameter. But I can get a great deal on another gti exhaust which is 2.5". Will this 0.5" really make any difference? I'm assuming it won't make a heck of a lot of difference in power but what about sound? Anyone have any experience with this?