Quote Originally Posted by bluegtp91 View Post
True, N/A cars probably don't NEED a 3" Downpipe...but is it going to hurt? No.
False. Exhaust velocity is what gives you the scavenging effect, giving you a lot more low end. Too big and you may gain on the high end, but you end up with no low end to get you there. The exhaust system needs to be balanced, which is why saying that every car should run a 3" DP is just ignorant.