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 Muffler with Carbon End Cap
- Massive Power gains throughout the RPM range.
- Huge weight savings
- New RTS (Rapid Tuning System)
- FMF uses the highest quality proprietary blend of alloy grade titanium made especially to our standards.
Item ID:045679
Type:Slip-On
Configuration:Single
Const:Aluminum
Finish:Gray Anodized
Midpipe:Stainless Steel
Endcap:Carbon
Spark Arrestor:Screen Insert (included)
Carb Warning:no
Quiet Insert:94dB Insert (included)
Weight:5.6 lbs.
2023: EC 350F
2022: EC 350F
2021: EC 250F, EC 350F
2023: FE 250, FE 350, FE 450, FE 501
2022: FE 250, FE 350, FE 450, FE 501
2021: FE 250, FE 350, FE 450, FE 501
2020: FE 250, FE 350, FE 450, FE 501
2023: 350 XCF-W, 450 XCF-W, 500 XCF-W
2022: 350 XCF-W, 500 XCF-W
2021: 350 XCF-W, 500 XCF-W
2020: 350 XCF-W, 500 XCF-W
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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