For Closed Course Competition Use Only. Not Intended for Street Use.

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

For Closed Course Competition Use Only. Not Intended for Street Use.

When designing the PowerCore4, we looked at our top of the line products to deliver race-inspired performance at an economical price. The end result is a quality muffler with improved torque, increased horsepower and rugged durability all at a price that won’t break the bank.

• Overall increase in power and torque
• Durable stainless steel and aluminum construction
• Advanced packing material for maximum longevity
• Champagne color anodized can
• Removable spark arrestor included
• Optional 96dB quiet insert available

For Closed Course Competition Use Only. Not Intended for Street Use.

The science behind the Megabomb header may be our greatest engineering accomplishment to date. You can bolt on a Megabomb with an existing FMF Racing slip on for as much as a 3hp boost, plus the Megabomb actually reduces noises levels by as much as 1.5dB. The Megabomb technology is revolved to produce more low end to mid range gains as well as broadening out the mid to top end power gains over stock. The Megabomb is best used for Motocross/Supercross and GNCC style trails. Used by Factory Teams, the Megabomb is the next level technology you can have today.

• Produces long header torque and short header over-rev
• Reduces sound output as much as 1.5dB
• Increases output from stock motor as much as 3hp
• Made from premium American TiMetal material
• #1 Header in 2011 Supercross, Motocross, Motocross of Nations and Monster Energy Cup!

For Closed Course Competition Use Only. Not Intended for Street Use.

The redesigned PowerBomb is a four-stroke header that incorporates FMF’s patented PowerBomb module at a precise location in the initial stage of the header. By positioning this “Bomb” at a key point in the system, increased performance and flow is achieved through the expansion and contraction of exhaust sonics through the system. Result is a flow increase of nearly 10%! The outer chamber in the Powerbomb allows the air to expand, cool and ramp back up at a higher velocity.

Additionally, the PowerBomb is a “pre-muffler” of sorts which helps to lower the bikes sound output by providing more sound absorbing surface area for the sound medium (exhaust gases). On some models, you can choose between a moto or supercross version. The supercross version is designed for more low to mid-range power where the moto version is focused in the mid to upper RPM range.

Select your application below for more info