ATV

FACTORY 4.1

YAMAHA YFZ450R'09-10 / 450X'10 FACTORY 4.1 COMPLETE EXHAUST SYSTEM W / SS POWERBOMB HEADER

The Factory 4.1 exhaust system with the Powerbomb header is FMF's premier exhaust system. This system is perfect for the track or dunes, and is used by factory teams such as KTM, Epic Can-Am and Rath Racing. The Powerbomb header is made of durable stainless steel to withstand any abuse.

Huge horsepower gains throughout RPM range

Advanced engineering and patent pending design

Available in natural or blue anodized finish

FACTORY 4.1

YAMAHA YFZ450R'09-10 / 450X'10 STAINLESS STEEL FACTORY 4.1 SLIP-ON MUFFLER

The Factory 4.1 is FMF Racing's premier ATV performance exhaust. It is guaranteed to produce more horsepower throughout the entire RPM range. If performance is your priority, the Factory 4.1 is the exhaust for you.

Titanium construction with durable stainless steel midpipe

Used by Factory teams such as KTM, Epic Can-Am and Rath Racing

Optional quiet insert or spark arrestor available

Available in natural or blue anodized finish (depending on model)

Use with FMF Powerbomb or Megabomb, or stock header

FACTORY 4.1

YAMAHA YFZ450R'09-10 / 450X'10 ANODIZED STAINLESS STEEL FACTORY 4.1 SLIP-ON MUFFLER

The Factory 4.1 is FMF Racing's premier ATV performance exhaust. It is guaranteed to produce more horsepower throughout the entire RPM range. If performance is your priority, the Factory 4.1 is the exhaust for you.

Titanium construction with durable stainless steel midpipe

Used by Factory teams such as KTM, Epic Can-Am and Rath Racing

Optional quiet insert or spark arrestor available

Available in natural or blue anodized finish (depending on model)

Use with FMF Powerbomb or Megabomb, or stock header

Q4 Muffler

YAMAHA YFZ450R'09-10 / 450X'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

Powercore 4 S/A

YAMAHA YFZ450R'09-10 / 450X'10 POWERCORE 4 MUFFLER

We developed the PowerCore4 to increase the horsepower and torque throughout the entire power curve producing a noticeable power increase that is useable and compatible with every style of riding. Aluminum construction and stainless steel Hi-Flo endcaps make for the perfect balance of performance and strength.

Aluminum performance muffler with durable stainless steel components

Completely redesigned for all late model applications

Removable spark arrestor included