Motocross

Factory 4.1C

YAMAHA YZ250F'10 FACTORY 4.1C COMPLETE EXHAUST SYSTEM W / TI MEGABOMB HEADER

By giving the Factory 4.1 system a carbon fiber shell combined with FMF's Megabomb or Powerbomb header, we made the world's best performing exhaust the world's lightest exhaust. The Factory 4.1 carbon system has been race tested for proven reliability and performance. If you want the lightest and best performing exhaust system available, the Factory 4.1 carbon system is for you.

The lightest full system available featuring the best carbon fiber on the market

Muffler easily serviced for repacking

Powerbomb header available in titanium or stainless steel, megabomb titanium only

94dB Insert Included

FACTORY 4.1

YAMAHA YZ250F'10 FACTORY 4.1 COMPLETE EXHAUST SYSTEM W / TI MEGABOMB HEADER

The Factory 4.1 system is FMF Racing's premier performance exhaust system. The 4.1 system comes with the choice of the Megabomb or Powerbomb header. Both systems guarantee horsepower gains throughout the RPM range and are the lightest titanium systems available.

Used by professional race teams such as Factory KTM, Yamaha of Troy and Star Racing

Horsepower gains throughout RPM range

Powerbomb header available in stainless steel or titanium; megabomb comes in titanium only

Muffler available in natural or blue anodized finish

94dB Insert Included

FACTORY 4.1

YAMAHA YZ250F'10 ANODIZED FACTORY 4.1 COMPLETE EXHAUST SYSTEM W / TI MEGABOMB HEADER

The Factory 4.1 system is FMF Racing's premier performance exhaust system. The 4.1 system comes with the choice of the Megabomb or Powerbomb header. Both systems guarantee horsepower gains throughout the RPM range and are the lightest titanium systems available.

Used by professional race teams such as Factory KTM, Yamaha of Troy and Star Racing

Horsepower gains throughout RPM range

Powerbomb header available in stainless steel or titanium; megabomb comes in titanium only

Muffler available in natural or blue anodized finish

94dB Insert Included

Factory 4.1C

YAMAHA YZ250F'06-10 / YZ450F'06-09 / WR250F / 450F'07-10 FACTORY 4.1C SLIP-ON MUFFLER

By giving the Factory 4.1 a carbon fiber shell, we made the world's best peforming exhaust the world's lightest exhaust. The Factory 4.1 Carbon utilizes the same cutting edge technology as the titanium version. Thuis exhaust doesn't just look Factory-it feels Factory. If you want the lightest and best performing exhaust available, the Factory 4.1 C is for you.

Race tested for proven reliabilty and performance

Use with stock or FMF Header

Easily serviced for repacking

94dB Insert Included

FACTORY 4.1

YAMAHA YZ250F'06-10 / YZ450F'06-09 / WR250F / 450F'07-10 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

FACTORY 4.1

YAMAHA YZ250F'06-10 / YZ450F'06-09 / WR250F / 450F'07-10 ANODIZED 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

FACTORY 4.1

YAMAHA YZ250F'06-10 / YZ450F'06-09 / WR250F / 450F'07-10 STAINLESS STEEL 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

FACTORY 4.1

YAMAHA YZ250F'06-10 / YZ450F'06-09 / WR250F / 450F'07-10 ANODIZED STAINLESS STEEL 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 Ti Muffler

YAMAHA YZ250F'06-10 / YZ450F'06-09 / WR250F / 450F'07-10 Q4 TITANIUM SPARK ARRESTOR MUFFLER

Using all the experience and R&D testing that went into the Q4, the next step was to create the ultimate off-road exhaust - the Titanium Q4. Sharing all of the advances found in the Q4, the Ti Q4 weighs less than most moto mufflers and measures below 93dB on nearly all models tested (no more than 96dB on any model). The best way to describe the Ti Q4 would be "less is more" - less weight, less noise, more places to ride.

American TiMetal canister and end caps

Max sound output 96dB; most models below 93dB

Comes standard with spark arrestor

Easily serviced for repacking

Removable spark arrestor included

Q4 Muffler

YAMAHA YZ250F'06-10 / YZ450F'06-09 / WR250F / 450F'07-10 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 Ti

YAMAHA YZ250F'06-10 / YZ450F'06-09 / WR250F / 450F'07-10 TITANIUM POWERCORE MUFFLER

The Ti Powercore is the best value in performance exhaust and is one of the best mufflers we have produced. With more power, lower center of gravity and titanium construction, we are bringing power, handling and style to the people. Now you can have Factory performance and looks for less.

Value priced performance muffler with titanium construction

Removable spark arrestor included

Use with stock or FMF header

Available in natural or blue anodized finish

Removable spark arrestor included

Powercore Ti

YAMAHA YZ250F'06-10 / YZ450F'06-09 / WR250F / 450F'07-10 ANODIZED TITANIUM POWERCORE MUFFLER

The Ti Powercore is the best value in performance exhaust and is one of the best mufflers we have produced. With more power, lower center of gravity and titanium construction, we are bringing power, handling and style to the people. Now you can have Factory performance and looks for less.

Value priced performance muffler with titanium construction

Removable spark arrestor included

Use with stock or FMF header

Available in natural or blue anodized finish

Removable spark arrestor included

Powercore 4 S/A

YAMAHA YZ250F'06-10 / YZ450F'06-09 / WR250F / 450F'07-10 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