200/250/300 SX/XC/XC-W 11-16 KTM POWERPARTS is proud to release the newest generation 2 stroke performance silencers from FMF. The new 2.1 POWERCORE utilizeS a new shape inspired from the 4.1 system. 2.1 TITANIUM POWERCORE: - Improved throttle response - 1.5lbs lighter than stock silencer