Motocross

FACTORY 4.1

HUSABERG FE390'10 / FE450 / 570'09-10 / FX450'10 / FS570'10 TITANIUM FACTORY 4.1 SLIP-ON MUFFLER

The Factory 4.1 is FMF Racing's premier performance exhaust. With 30 years of racing experience behind it, the Factory 4.1 takes advantage of everything we've learned on the race track.

Available in natural or blue anodized finish.

Horsepower gains throughout RPM range.

Available with titanium or high strength stainless steel midpipe.

94dB Insert Included

Q4 Muffler

HUSABERG FE390'10 / FE450 / 570'09-10 / FX450'10 / FS570'10 Q4 SPARK ARRESTOR MUFFLER

FMF is the leader in high performance quiet technology and our Q4 is the next evolution in off road exhaust. The Q4 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!

Developed over years of championship off-road racing

Max Sound output 96dB; most models below 93dB

Constructed from aircraft grade aluminum and high strength stainless steel

Use with stock or FMF header

Removable spark arrestor included

Powercore 4 S/A

HUSABERG FE390'10 / FE450 / 570'09-10 / FX450'10 / FS570'10 POWERCORE 4 MUFFLER

We developed the PowerCore4 to increase the horsepower and torque throughout the entire power curve and give you a noticeable power increase that is very usable and beneficial, no matter what your riding style or ability is.

Space Age internal packing for maximum packing life.

Hi-Flo modular end cap.

Internal shape of core uses Hi-Flo technology.

Enhanced sonic evacuation provides for higher flow and increased power.

Removable spark arrestor included