Bought this bike used with 4000 miles recently. 103, SERT, SE heavy breather and a Supertrapp Paul Yaffe Phantom baffled 2-1. Pipe styled for a stretched bag, big wheel bike (not my bike). Didn't seem to pull well. Added 255's and had it dyno'd. Very disappointed to see 77hp and 106 ft lb torque. Shop said the pipe is crazy restrictive. Today, I installed a Bassani Road Rage FLH 757 2-1. Now made 92hp and 118ft lb torque. The Supertrapp to Bassani switch made 15hp difference. Now the bike works like it should! Obviously, I now have a Supertrapp for sale!