Taking the proven success of the Powercore 2, FMF created the Powercore 2 Shorty, with a shorter inner core length and aluminum canister. This design results in a finely tuned bolt on performance silencer that maximizes bottom and mid rpm power. An excellent choice for tight tracks and supercross track applications. Extruded from aircraft 6060 T6 alloy Completely repackable Maximum performance, minimum noise Fits stock pipes as well as aftermarket pipes .