Thinking about a glasspack...

[JThiessen]

Thanks Tempted - I was going to say something about that also. Antoher misconception is that a bigger exhaust is going to give you more power. IC motors rely on a certain amount of backpressure to give torque. So for all those that go ripping out the kitty's, do so with the knowledge that someone a heck of a lot smarter than you did many hours of research putting that exhaust system in place. Yes, in some cases they sacrificed some power for efficiency and regulatory requirements, but overall, they are sized about right.