The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology both internally and externally. It starts at the center with a new core - a patent pending shape enhances and refines the exhaust pressure wave for optimal power output while lowering the sound level. In addition, it achieves a shorter overall length that is less susceptible to crash damage and complementary to the Factory Forward Engineering - moving the muffler(s) closer to the motor to centralize mass. Visible changes to the exterior include a redesigned canister to increase internal capacity for the maximum volume of packing material. The packing itself was not overlooked - a proprietary blend formulated for superior durability and sound attenuation. The final component is a new rear endcap engineered for simple tuning adjustments incorporating a snap ring feature to secure the standard and optional inserts.
- Massive POWER gains throughout the RPM range.
- Quieter than stock.
- Huge weight savings.
- Includes midpipe.
- Can be used with FMF header or stock.
- New RTS (Rapid Tuning System) makes for easy sound insert changes as well as adding U.S. Forestry Service Approved Spark Arrestor.
- #1 Exhaust in AMA Supercross Series, AMA Motocross Series, FIM Motocross of Nations and the Monster Energy Cup!
- Note: Quiet Core insert and Spark Arrestor are one, single unit.
The Factory 4.1 RCT is constructed from only aerospace-grade materials that meet FMF's exacting specifications and 100% manufactured at their Southern California factory.
Note: For closed course competition use only. Not intended for street use.
Detailed Specifications:
- Type: Slip-On.
- Configuration: Single.
- Construction: Titanium.
- Finish: Blue anodized.
- Midpipe: Titanium.
- Endcap: Carbon.
- Spark arrestor: Screen insert (included).
- Quiet insert: 94dB insert (included).
- Weight: 4.2 pounds.
