FMF Factory 4.1 RCT silencer 4-stroke 450-500 (EXC, SMR, SX, XC, XCF) 23-25Silencer housing made of high grade aluminum Carbon silencer cap Mounting also possible with original header Significantly more torque Substantial weight saving Noticeable performance enhancement In connection with an FMF Megabomb header even further increase in rideability and power output can be achieved. Approvals: CCCUO_EU, FIM Colour: grey Material: Carbon, Stainless steel not available in: , , , , , , , , , , , , , , , , , , , , , , , , , , , ,