FMF Factory-4.1 RCT Aluminum / Stainless Silencer with Carbon End Cap
FMF Factory-4.1 RCT Aluminum / Stainless Silencer with Carbon End Cap

FMF Factory-4.1 RCT Aluminum / Stainless Silencer with Carbon End Cap

Regular price
$599.99
Sale price
$599.99

**Some FMF fitments are out of stock because of availability from the manufacturer and therefore are a pre-order. Lead times range from 4 weeks to 12 weeks**

If you're a rider looking for a silencer that's packing stellar looks and increased performance from a staple brand in motorsports, the FMF Factory 4.1 RCT Aluminum Silencer with Carbon End Cap is an option that we think sits close to the top of the class.

FMF distinguishes their 4.1 RCT from other silencers from the start by using premium materials and a refined design developed over years of industry experience. Features like FMF’s unique Resonance Chamber Technology™ (RCT), a specialized chamber that sits at the front of the slip-on, lowers your exhaust decibel level so it complies with FIM 2M max sound tests and the stringent AMA sound requirements so you can get onto any trail and into any race where noise level regulations are enforced.

While the RCT lowers sound, what's better is that it won't eat up your bike's power either. In Fact the RCT chamber design refines and enhances exhaust pressure to give your bike gains throughout the rpm range. Power increases are tunable as well with the end cap housing FMF's new Rapid Tuning System (RTS) that lets you swap between race tips (sold seperately) and the 94 db Quiet Core insert. With this level of performance and versatility FMF's Factory 4.1 RCT Silencers really do serve as an excellent option for all types dirt and off-road riders.

Specs:

  • Stainless and carbon end caps
  • Aluminum alloy canister body
  • Rapid Tuning System (RTS) allows for swapable end cap inserts (sold seperately)
  • Compatible with FMF and OEM headers
  • Resonance Chamber Technology (RCT) lowers sound and refines exhaust gas pressure
  • Increases performance throughout the rpm range
  • Efficient design centralizes mass and makes silencer body less prone to damage in a crash
  • Increased packing material volume in main body canister
  • Meets AMA and FIM sound regulations and requirements
  • Quiet Core 94db end cap insert included
  • USFS spark arrestor included and pre-installed in silencer
  • 100% American made in California
  • Easily removable end cap for quick servicing and repacking
  • Available in various finishes and end cap materials

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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
 
FOR ANY FITMENT QUESTIONS CONTACT US 


FITMENT:

045632
Make / Model / Year
GAS GAS / EX250F / 21
GAS GAS / MC250F / 21
HUSQVARNA / FC250 / 19-21
KTM / 250 SX-F / 19-21
KTM / 250 XC-F / 19-21

045628
Make / Model / Year
GAS GAS / EX350F / 21
GAS GAS / EX450F / 21
GAS GAS / MC450F / 21
HUSQVARNA / FC350 / 19-21
HUSQVARNA / FC450 / 19-21
HUSQVARNA / FC450 ROCKSTAR EDITION / 18,20-21
HUSQVARNA / FX350 / 19-21
HUSQVARNA / FX450 / 19-21
KTM / 350 SX-F / 19-21
KTM / 350 XC-F / 19-21
KTM / 350 XC-F KAILUB RUSSELL / 21
KTM / 450 SX-F / 19-21
KTM / 450 SX-F FACTORY EDITION / 18,20-21
KTM / 450 XC-F / 19-21 

045647
Make / Model / Year
GAS GAS / EC250F / 21
GAS GAS / EC350F / 21
HUSQVARNA / FE250 / 20-21
HUSQVARNA / FE350 / 20-21
HUSQVARNA / FE350 ROCKSTAR EDITION / 21
HUSQVARNA / FE450 / 20-21
HUSQVARNA / FE501 / 20-21
KTM / 350 XCF-W / 20-21
KTM / 450 XCF-W / 20-21
KTM / 500 XCF-W / 20-21 
    045594
    Make / Model / Year
    HUSQVARNA / FC250 / 16-18
    HUSQVARNA / FC350 / 16-18
    HUSQVARNA / FC450 / 16-18
    HUSQVARNA / FE250 / 17-19
    HUSQVARNA / FE350 / 17-19
    HUSQVARNA / FE450 / 17-19
    HUSQVARNA / FE501 / 17-19
    HUSQVARNA / FX350 / 17-18
    HUSQVARNA / FX450 / 17-18
    KTM / 250 EXC-F / 17-19
    KTM / 250 SX-F / 16-18
    KTM / 250 SX-F FACTORY EDITION / 15-17
    KTM / 250 XC-F / 16-18
    KTM / 350 EXC-F / 17-19
    KTM / 350 SX-F / 16-18
    KTM / 350 XC-F / 16-18
    KTM / 450 EXC-F / 18-19
    KTM / 450 EXC-F SIX DAYS / 17-19
    KTM / 450 SX-F / 16-18
    KTM / 450 SX-F FACTORY EDITION / 15-17
    KTM / 450 XC-F / 16-18
    KTM / 500 EXC-F / 17-19