Silent Pro Exhaust for Piaggio 50cc 2-stroke scooters. The Silent Pro exhaust is a higher performing exhaust than stock, all while being quiet and maintaining a subtle look. Works well on 50cc and 70cc cylinders. Fits the following models with Piaggio engines: Aprilia: SR50 LC, SR50 Motard, Scarabeo 50, Sport City One 50 Derbi: Atlantis 50, GP1 50 Piaggio: Fly 50, Typhoon 50 Please Note: This exhaust is designed to conform to European Road Standards. Removing the manifold restrictor leads to a significant performance improvement.