Exclusive muffler for KTM PowerParts used by our factory offroad team. The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally. In addition, we achieve a shorter overall length that is less susceptible to crash damage and complementary to our Factory Forward Engineering
» Moving the muffler closer to the motor to centralize mass. The Factory 4.1 RCT is constructed from only aerospace grade materials that meet our exacting specifications and is manufactured 100% at FMF’s Southern California factory.
» Natural Titanium Muffler with Titanium End cap
» New RTS (Rapid Tuning System)
» Significant weight savings
» FMF uses the highest quality proprietary blend of alloy grade titanium made especially to our standards.
Can be used with FMF or Stock OEM Header.
- AMA Amateur
- Closed Course Competition Use Only
- KTM 250 SX-F 2009-2015
- KTM 250 XC-F 2009-2015
- KTM 250 XCF-W 2009-2016
- KTM 350 SX-F 2011-2015
- KTM 350 XC-F 2011-2015
- KTM 350 XCF-W 2012-2016
- KTM 450 SX-F 2009-2015
- KTM 450 XC-F 2009-2015
- KTM 500 EXC 2013
- KTM 500 XC-W 2015