**FMF’s are in and out of stock based on availability from the manufacturer. Lead times range from 2 weeks to 12 weeks. Email us to confirm if the one you need is in stock at the time of order**
The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally. In addition, we achieve a shorter overall length that is less susceptible to crash damage and complementary to our Factory Forward Engineering - moving the muffler closer to the motor to centralize mass. The Factory 4.1 RCT is constructed from only aerospace grade materials that meet our exacting specifications and is manufactured 100% at our Southern California factory.
-Available in Natural Aluminum with Carbon Fiber End Cap
-Massive Power gains throughout the RPM range.
-Huge weight savings
-New RTS (Rapid Tuning System)
-FMF uses the highest quality proprietary blend stainless steel made especially to our standards.
FOR ANY FITMENT QUESTIONS CONTACT US
TYPE A (PN#045634)
- 19-20 FC 250
- 19-20 250 XC-F, SX-F
TYPE B (PN#045636)
- 19-20 FC, FX 350
- 19-20 350 XC-F, SX-F
TYPE C (PN#045650)
- 20 FEs, FE 350 (no O2 sensor bung)
- 20 350 EXC-F, XCF-W (no O2 sensor bung)
TYPE D (PN#045638)
- 19-20 FC, FX 450
- 19-20 450 XC-F, SX-F
- 18,20 FC 450 ROCKSTAR EDITION
- 18 450 SX-F FACTORY EDITION
TYPE E (PN#045662)
- 20 FEs, FE 501 (no O2 sensor bung)
- 20 500 EXC-F, XCF-W (no O2 sensor bung)
Sound levels at idle speed tested at 1' above and 1' behind each
muffler on the same 21' 500 EXCF tested back to back.
Stock muffler 82
Stock w Pro Moto end cap / ultra silent insert 85
Stock w Pro Moto end cap / silent insert 86
Stock w Pro Moto end cap 88
Graves Motorsports w db killer 85
Graves Motorsports 89
Fmf q4 84
Fmf 4.1 88
Fmf power core 88
Lexx w db killer 86
Lexx w spark arrestor insert 87
Lexx 89
Akropovic 85