Polini Race 3 High Performance Exhaust for 50cc 2-Stroke Air or Liquid-Cooled Piaggio and Gilera Scooters COMPATIBILITY: Aprilia – SR R-Factory ’04-07 (Piaggio Engine) Derbi – GP1 50 2T ’01-03 Gilera – DNA 50 2T, Easy Moving 50 2T, Ice 50 2T, Runner SP-Poggiali 50 2T, Stalker 50 2T, Storm 50 2T, Typhoon (X) 50 2T Piaggio – Diesis, Extrem, Fly, Free, Liberty, MC2-98, NRG MC3, NRG-NTT-MC2, NRG Power DD, Quartz, Sfera, Zip, Zip Fast Rider, Zip SP This Polini high performance Race 3 exhaust is for the 2-stroke engine and not the 4-stroke. Please check your scooter if it is compatible before placing the order. **