I was going to put a Supertrapp on this build, but decided that would be overkill for a MB. I went instead with a Phantom custom pipe and I'm glad I did. It came in today with a nice billet aluminum cap,an aluminum mounting clamp, and its wrapped in beige insulation to prevent leg burn. It is a glass packed pipe and it has that "cherry bomb" sound to it. It screams, "Hey, I'm having fun", not "hey, I'm obnoxious". The pipe fit fine with a SBP shift kit and it looks great. Well worth the substantial price. Took the bike out for a quick spin around the neighborhood and love the way it sounds and the way it performs. This is not your typical single speed ride. I strongly endorse the upgrade to the air filter, the bigger jet, and the minimally restrictive pipe. Most important is the ability to shift. All you really need is three gears. What's next? I've ordered a metal locking tool kit that I'll be installing in a couple of days.