FMF FULL SYSTEM STAINLESS / ALUM  W CARBON CAP 20+ 500 / 501
FMF FULL SYSTEM STAINLESS / ALUM  W CARBON CAP 20+ 500 / 501
FMF FULL SYSTEM STAINLESS / ALUM  W CARBON CAP 20+ 500 / 501
FMF FULL SYSTEM STAINLESS / ALUM  W CARBON CAP 20+ 500 / 501

FMF FULL SYSTEM STAINLESS / ALUM W CARBON CAP 20+ 500 / 501

Regular price
$1,024.99
Sale price
$1,024.99

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.

P/N# 045662

  • 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 to proprietary standards.

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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

FITMENT:

    045662
    Make / Model / Year
    2020+ HUSQVARNA 501 FEs, FE
    2020+ KTM 500 EXC-F, XCF-W