FMF Factory 4.1 Rct stainless steel/aluminum with carbon end cap silencer KTM 450 EXC-F 17-19

RCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power output;
Internal ducts in the chambers of the RCT system increase internal volume for improved exhaust flow, resulting in power gains throughout the entire range of power;
FMF’s Factory Forward Engineering centralizes mass and is less prone to crash damage;
Innovative rear end cap features simple installation of tuning tip inserts or spark arrestor with the removal of four screws;
Compatible with stock header or FMF header pipe;
Meet AMA and FIM sound requirements;
QuietCore 94db insert included;
Spark arrestor included in muffler.

Made in the U.S.A.

Over the decades, we’ve seen an amazing transformation in the world of motorcycles and ATVs. The progression of the technology is one of the challenges that keeps us going. FMF was there in the days when the singleshock and watercooled engines were huge innovations and we’re glad to be here now for the aluminum chassis and electronic fuel injection. Our goal will never change - take the most advanced machinery to its limit by building the world’s best performing exhausts. And its a fact, we build every exhaust by hand from start to finish right here in the U.S.

At the end of the day, there is always one major force keeping us motivated–throwing a leg over the bike and heading for the trails or the track. The biggest reward for us is knowing we’re helping our customers get the most out of their riding experience. We still ride every chance we get so we never forget why we got into this business in the first place.