FMF brings you the Slip-On Factory 4.1 RCT muffler, a high-end solution designed for HUSABERG, HUSQVARNA and KTM motocross bikes, combining performance, lightness and robustness. This model incorporates FMF's exclusive Resonance Chamber Technology™, applied both inside and outside the silencer body, to optimize throttle flow and improve the power curve throughout the rev range. Thanks to its Factory Forward Engineering design, the muffler is moved closer to the engine to centralize mass, while reducing its overall length to limit exposure to impact and improve handling in competition. Manufactured 100% in the FMF plant in Southern California, the Factory 4.1 RCT is designed with aerospace-grade materials to exacting manufacturing standards, guaranteeing exceptional durability and significant weight reduction. It is also equipped with the RTS (Rapid Tuning System), enabling rapid and precise adjustment without complex disassembly. This silencer is the strategic choice for demanding drivers looking for pure performance and reliability on the racetrack.

Mounts on

HUSABERG FE 250 2014

HUSABERG FE 250 2014

HUSABERG FE 250 2013

HUSABERG FE 250 2013

HUSABERG FE 350 2014

HUSABERG FE 350 2014

HUSABERG FE 350 2013

HUSABERG FE 350 2013

HUSABERG FE 501 2014

HUSABERG FE 501 2014

HUSABERG FE 501 2013

HUSABERG FE 501 2013

HUSQVARNA FE 250 2016

HUSQVARNA FE 250 2015

HUSQVARNA FE 250 2014

HUSQVARNA FE 350 2016

HUSQVARNA FE 350 2015

HUSQVARNA FE 350 2014

HUSQVARNA FE 450 2016

HUSQVARNA FE 450 2015

KTM EXC 450 2011

KTM EXC 450 2010

KTM EXC 450 2009

KTM EXC-R 450 2008

KTM SMR 450 2013

KTM SX-F 250 2015

KTM SX-F 250 2014

KTM SX-F 250 2013

KTM SX-F 250 2012

KTM SX-F 250 2011

KTM SX-F 250 2010

KTM SX-F 250 2009

KTM SX-F 350 2015

KTM SX-F 350 2014

KTM SX-F 350 2013

KTM SX-F 350 2012

KTM SX-F 350 2011

KTM SX-F 450 2015

KTM SX-F 450 2015

KTM SX-F 450 2014

KTM SX-F 450 2014

KTM SX-F 450 2014

KTM SX-F 450 2013

KTM SX-F 450 2013

KTM SX-F 450 2013

KTM SX-F 450 2012

KTM SX-F 450 2012

KTM SX-F 450 2011

KTM SX-F 450 2010

KTM SX-F 450 2009

KTM SX-F 450 2008

KTM SX-F 450 2007

KTM XC-F 250 2015

KTM XC-F 250 2014

KTM XC-F 250 2013

KTM XC-F 250 2011

KTM XC-F 250 2009

KTM XC-F 350 2015

KTM XC-F 350 2014

KTM XC-F 350 2013

KTM XC-F 350 2012

KTM XC-F 350 2011

KTM XC-F 450 2015

KTM XC-F 450 2014

KTM XC-F 450 2013

KTM XC-F 450 2009

KTM XC-W 450 2016

KTM XC-W 450 2015

KTM XC-W 450 2014

KTM XC-W 450 2013

KTM XC-W 450 2012

KTM XC-W 450 2010

KTM XC-W 450 2009

KTM XC-W 500 2016

KTM XC-W 500 2015

KTM XC-W 500 2014

KTM XC-W 500 2013

KTM XCF-W 250 2016

KTM XCF-W 250 2015

KTM XCF-W 250 2014

KTM XCF-W 250 2013

KTM XCF-W 250 2012

KTM XCF-W 250 2010

KTM XCF-W 250 2009

KTM XCF-W 350 2016

KTM XCF-W 350 2015

KTM XCF-W 350 2014

KTM XCF-W 350 2013

KTM XCF-W 350 2012

KTM XCR-W 450 2008