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FMF

FMF Factory 4.1 RCT Exhaust System Kawasaki KX250 / KX250X 2025

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FMF 4-Stroke Muffler Re-Pack Instructional Video

Mega Bomb Titanium/Blue Titanium/Carbon Fiber

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FMF Factory 4.1 RCT Full System Kawasaki KX250 / KX250X

If you're looking to reduce weight, enhance aesthetics and most importantly, boost your bike's power band, the FMF Factory 4.1 RCT full system is the perfect choice. Made from aerospace-grade materials to FMF's precise standards, it is entirely manufactured in their Southern California facility. The patented MegaBomb header design helps exhaust gases expand, cool and then re-accelerate at higher velocity, providing the torque benefits of longer headers while maintaining the over-rev advantages of shorter ones. The muffler is more compact than the OEM version, reducing crash damage risk and supporting a centralized mass design by positioning it closer to the engine. Additionally, the rear end cap features a retaining ring for quick and easy tuning, securely holding both standard and optional inserts in place.

Features:

Massive power gains throughout the RPM range
Huge weight savings over stock exhaust
RTS (Rapid Tuning System) for quick and easy track-side tuning
Removable spark arrestor included
Meets AMA and FIM sound requirements
100% made in the USA