I currently have a Scorpion red power carbon fiber exhaust. It looks good, but it just doesn't have the rumble that I'm looking for in an exhaust. I've been shopping around and I've noticed that the M4 gp is really popular for zx6r's. Why is this so popular for zx6r owners? I know that it's a loud pipe, but are there any other advantages? I personally don't think it looks good. So I'm just wondering why so many people are buying this pipe?