21-24 KX250F 4.1 RCT FS SS/AL W/CF EC W/SS MGB HDR
- RCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power output
- Made in the U.S.A.
- QuietCore 94 dB insert included
- Meets AMA and FIM sound requirements
- Innovative rear end cap features simple installation of tuning tip inserts or spark arrestor with the removal of four screws
- FMF's Factory Forward Engineering centralizes mass and is less prone to crash damage
- 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
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