FMF Racing has two new Factory 4.1 RCT slip-ons (in stainless steel or titanium) for the 2026 Ducati Desmo450 MX and Desmo450 EDX.
The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology both internally and externally. It has a shorter overall length that is less susceptible to crash damage locates the muffler closer to the motor to centralize mass.
The Factory 4.1 RCT is constructed from only aerospace-grade materials and is manufactured at FMF’s Southern California factory. It has FMF’s RTS (Rapid Tuning System) that allows for swapping of exhaust inserts to refine the exhaust pressure wave for optimal power output.
The closed-course-use only slip-on meets AMA sound requirements and offers weight savings and power gains throughout the rpm range.
The titanium version ($854.99) comes with a blue-anodized muffler with a carbon end-cap.
Factory 4.1 RCT Stainless SL (Slip-On) w/ Carbon End-Cap (P/N 045713)
The version with the stainless-steel midpipe also comes with a carbon end-cap, and it is anodized in gray, with an MSRP of $674.99.
