FMF Racing Factory 4.1 RCT Titanium With Carbon End-Cap Full System MX Exhaust Rails & Accessories 3-layer face foam

3-layer face foam

Different power output means different calibration

Zipper and button snap closures

Renthal 520 KTM Steel Front Sprocket

In 2010 the RS-4 muffler helped Ryan Dungey claim the AMA 450 Supercross and Motocross championships in his rookie season

FMF Racing Factory 4.1 RCT Titanium With Carbon End-Cap Full System MX Exhaust Rails & Accessories 3-layer face foamFMF Factory 4. 1 RCT Full System If you are looking to drop weight, improve looks and most importantly improve your bikes power band then look no further. The FMF Factory 4. 1 RCT full system is constructed from aerospace grade materials that meet FMF's exacting specifications and is 100% manufactured in their Southern California factory. The patented MegaBomb header design allows exhaust gases to expand, cool and ramp back up at a higher velocity.