FMF is the leader in high performance quiet technology and our Q4 (QUITE 4 STROKE) HEX is the next evolution in off road exhaust. The Q4 (QUITE 4 STROKE) employs intricate chambers, baffles and proprietary multistage packing material making it the best performing quiet muffler available.
With the Q4 you don’t need to hear the power, just feel the power!
- Less sound equals more ground
- Only US manufacturer to offer dedicated quiet exhaust systems
- All aluminum and stainless steel construction
- Meets USFS and FIM World Enduro sound regulations
- Power gains throughout the entire rpm range
- Spark arrestor included
- Pounds lighter than stock
- Rugged design for off-road endurance
- MADE IN THE USA
Jimmy Lewis Dirt Bike Test Review
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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:
045646
Make / Model / Year
GAS GAS / EC250F / 21
GAS GAS / EC350F / 21
HUSQVARNA / FE250 / 20-21
HUSQVARNA / FE350 / 20-23
HUSQVARNA / FE350 ROCKSTAR EDITION / 21
HUSQVARNA / FE450 / 20-21,23
HUSQVARNA / FE501 / 20-24
KTM / 350 EXCF / XCF-W / 20-24
KTM / 450 EXCF / XCF-W / 20-21,23-24
KTM / 500 EXCF / XCF-W / 20-24
045590
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