4 Stroke Dirt Bike Exhausts

FMF - Factory 4.1 RCT Slip-On (KTM)

• All new incorporating the latest in Resonance Chamber Technology
• Patented core shape lowers sound level while maintaining maximum power output
• Patented canister shape increases internal volume for more sound abosrbing material
• Patented chamber design to enhance and refine...

FMF - Factory 4.1 Complete System with RCT:

• All new incorporating the latest in Resonance Chamber Technology
• Patented core shape lowers sound level while maintaining maximum power output
• Patented canister shape increases internal volume for more sound absorbing material
• Patented chamber design to enhance and...

FMF - Factory 4.1 RCT Slip-On (Yamaha):

Get the factory look, sound and power without the cost with the FMF Factory 4.1 RCT Slip-on muffler for Yamaha 4-stroke motocross bikes. An all new design that incorporates the latest in resonance chamber technology, the 4.1 RCT slip-on gives an increase...

FMF - Factory 4.1 Complete System with RCT:

• All new incorporating the latest in Resonance Chamber Technology
• Patented core shape lowers sound level while maintaining maximum power output
• Patented canister shape increases internal volume for more sound absorbing material
• Patented chamber design to enhance and...

FMF - Factory 4.1 Complete System with RCT:

• All new incorporating the latest in Resonance Chamber Technology
• Patented core shape lowers sound level while maintaining maximum power output
• Patented canister shape increases internal volume for more sound absorbing material
• Patented chamber design to enhance and...

Pro Circuit - Ti-6 Titanium Exhaust System (Kawasaki)

The Pro Circuit Ti-6 Titanium Exhaust System is designed to improve performance and is constructed of titanium throughout the head pipe, mid pipe, and muffler canister while the end-cap is constructed of carbon fiber. The Ti-5 showed weak points. So with...

 FMF - Factory 4.1 RCT Slip-On (Kawasaki):

Get the factory sound, look and power without the cost with the FMF Factory 4.1 RCT Slip-on muffler for Kawasaki 4-stroke motocross bikes. An all new design that incorporates the latest in resonance chamber technology, the 4.1 RCT slip-on gives an increase...

FMF - Factory 4.1 RCT Slip-On (Husqvarna):

• All new incorporating the latest in Resonance Chamber Technology
• Patented core shape lowers sound level while maintaining maximum power output
• Patented canister shape increases internal volume for more sound abosrbing material
• Patented chamber design to enhance and refine...

FMF - Powercore 4 Muffler (some models have a spark arrestor)
• 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.
•...

Moose Racing - Pipe Armor:
Protect your pipe from damage with the Moose Racing Pipe Armor. Easily installed in minutes on your 2-stroke or 4-stroke pipe.
Features::
• Privateer priced pipeguard with works protection
• Sturdy armor for your vulnerable and expensive exhaust
• 3mm aluminum is the thickest pipe...

Moose Racing - Pipe Guards
• Moose Racing pipe guards offer the most protection, style and durability on the market.
• Custom molded to fit perfectly every time.
• Carbon fiber, Kevlar, fiberglass and high temp resins yield an exeptional guard. 8 times stronger, two times stiffer yet 1.5 times...

 FMF - Factory 4.1 RCT Slip-On (Honda):

Get the factory sound, look and power without the cost with the FMF Factory 4.1 RCT Slip-on muffler for Honda 4-stroke motocross bikes. An all new design that incorporates the latest in resonance chamber technology, the 4.1 RCT slip-on gives an increase...

FMF - Powercore 4 Hex Yamaha Slip-On:
Grab yourself the a brand new Powercore 4 Hex slip on exhaust today and unleash the true power of your Yamaha! These FMF Powercore4 Hex slip-ons are one of the most affordable ways to increase horsepower, torque, and give your bike a sick...

Pro Circuit - Ti-6 Pro Titanium Exhaust System (Kawasaki):
Pro Circuit's Ti-6 Pro Titanium Exhaust System was created for professional racers competing in a series such as AMA Supercross or AMA Motocross to ensure they pass AMA/FIM sound regulations. The Ti-6 Pro Titanium Exhaust System is constructed of titanium throughout...

Pro Circuit- T-6 Stainless Exhaust System (Kawasaki)
The Pro Circuit T-6 Stainless Exhaust System is designed to improve performance and is constructed of stainless steel throughout the head pipe, mid pipe, and end-cap for longetivity while the muffler canister is made of aluminum. Pro Circuit wanted to focus on improving...

FMF - Megabomb Header Titanium
• FMF's latest power booster!
• Runs well with sound-restricting mufflers
• Effectively Reduces Sound Output by as much as 1.5dB
• Less Susceptible to Damage than a Long Header
• Produces the Low End of a Long Header and the Top End of a...

FMF - Megabomb Header Stainless (Honda)
• FMF's latest power booster!
• Runs well with sound-restricting mufflers
• Effectively Reduces Sound Output by as much as 1.5dB
• Less Susceptible to Damage than a Long Header
• Produces the Low End of a Long Header and the Top End of...

FMF - Powerbomb Header
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...

 FMF - Factory 4.1 RCT Slip-On (Suzuki):

Get the factory sound, look and power without the cost with the FMF Factory 4.1 RCT Slip-on muffler for Suzuki 4-stroke motocross bikes. An all new design that incorporates the latest in resonance chamber technology, the 4.1 RCT slip-on gives an increase...

FMF - Megabomb Header Titanium
• FMF's latest power booster!
• Runs well with sound-restricting mufflers
• Effectively Reduces Sound Output by as much as 1.5dB
• Less Susceptible to Damage than a Long Header
• Produces the Low End of a Long Header and the Top End of a...

FMF - Megabomb Header Stainless (Yamaha)
• FMF's latest power booster!
• Runs well with sound-restricting mufflers
• Effectively Reduces Sound Output by as much as 1.5dB
• Less Susceptible to Damage than a Long Header
• Produces the Low End of a Long Header and the Top End of...

FMF - Powercore 4 Muffler (some models have a spark arrestor)
• 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.
•...

FMF - Megabomb Stainless Header (KTM)
• FMF's latest power booster!
• Runs well with sound-restricting mufflers
• Effectively Reduces Sound Output by as much as 1.5dB
• Less Susceptible to Damage than a Long Header
• Produces the Low End of a Long Header and the Top End of...

FMF - Megabomb Header Titanium
• FMF's latest power booster!
• Runs well with sound-restricting mufflers
• Effectively Reduces Sound Output by as much as 1.5dB
• Less Susceptible to Damage than a Long Header
• Produces the Low End of a Long Header and the Top End of a...

Pro Circuit - T-6 Stainless Slip-On Exhaust (Kawasaki)
The Pro Circuit T-6 Stainless Steel Slip-On exhaust is designed for the rider looking for an easy-to-install, durable performance silencer that is compatible with their stock head pipe. The T-6 Slip-On is constructed of stainless steel throughout the mid-pipe and end-cap, while...

FMF - Powerbomb Header
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...

Pro Circuit - T-6 Stainless Slip-On Exhaust (Yamaha)
Exhaust Description: 
The T-6 Stainless Slip-On Silencer is designed for a rider looking for an inexpensive, easy-to-install, durable performance silencer that can bolt onto their stock head pipe. This slip-on silencer comes with a stainless steel end-cap and an aluminum canister for increased...

FMF - Powercore 4 Slip-On Muffler (Honda):
Looking for a quick and affordable way to give your Honda a quick power boost? This FMF Powercore 4 Hex exhaust is a top choice for riders looking to improve torque and horsepower without breaking the bank. FMF has designed these Powercore 4...

Pro Circuit - T-6 Stainless Exhaust System
The T-6 Stainless Steel Exhaust System offers the same benefits as the Ti-6 Dual System, but the T-6 System is constructed of stainless steel throughout the head pipe, y-collector mid pipe, and end-caps while the canisters are constructed of aluminum for increased durability...

FMF - Megabomb Header Titanium:
FMF's latest power booster!
Runs well with sound-restricting mufflers
Effectively Reduces Sound Output by as much as 1.5dB
Less Susceptible to Damage than a Long Header
Produces the Low End of a Long Header and the Top End of a Short Header
Improved Bottom to...

FMF - Megabomb Header Stainless (Kawasaki)
• FMF's latest power booster!
• Runs well with sound-restricting mufflers
• Effectively Reduces Sound Output by as much as 1.5dB
• Less Susceptible to Damage than a Long Header
• Produces the Low End of a Long Header and the Top End of...

FMF - Q4 Hex Slip-On Muffler (Honda)
• Less osund equals more ground.
• 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.
...

FMF - Q4 Hex Slip-On Muffler (Yamaha)
NOT LEGAL FOR USE IN CALIFORNIA ON POLLUTION CONTROLLED
• Less osund equals more ground.
• Meets USFS and FIM World Enduro sound regulations.
• Power gains throughout the entire rpm range.
• Spark arrestor included.
• Pounds lighter than stock.
• Rugged...

Pro Circuit - Ti-6 Pro Titanium Exhaust System (Yamaha):
Pro Circuit's Ti-6 Pro Titanium Exhaust System was created for professional racers competing in a series such as AMA Supercross or AMA Motocross to ensure they pass AMA/FIM sound regulations. The Ti-6 Pro Titanium Exhaust System is constructed of titanium throughout...

FMF - Powercore TI Natural Muffler (Yamaha)
The titanium PowerCore is one of the best products we have ever produced states Don Emler and he adds A performance titanium muffler for $299 - why wouldn't you put this on your bike? Better performance, titanium construction and no more than 100dB. ...

Pro Circuit - Ti-6 Titanium Exhaust System (Yamaha)

The Pro Circuit Ti-6 Titanium Exhaust System is designed to improve performance and is constructed of titanium throughout the head pipe, mid pipe, and muffler canister while the end-cap is constructed of carbon fiber. The Ti-5 showed weak points. So with...

FMF - Powercore 4 Muffler (some models have a spark arrestor)
• 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.
•...

Pro Circuit- T-6 Stainless Exhaust System (Kawasaki)
The Pro Circuit T-6 Stainless Exhaust System is designed to improve performance and is constructed of stainless steel throughout the head pipe, mid pipe, and end-cap for longetivity while the muffler canister is made of aluminum. Pro Circuit wanted to focus on improving...

FMF - Megabomb Header Titanium
• FMF's latest power booster!
• Runs well with sound-restricting mufflers
• Effectively Reduces Sound Output by as much as 1.5dB
• Less Susceptible to Damage than a Long Header
• Produces the Low End of a Long Header and the Top End of a...

 FMF - Powercore 4 Hex Slip-on Muffler (Kawasaki):
This FMF Slip On Powercore 4 Hex exhaust is designed for closed course riding only as it increases the overall horsepower and torque of your Kawasaki. The Powercore 4 Hex uses Hi-Flo technology in the internal shape of the core and an...

FMF - Q4 Hex Slip-On Muffler (Kawasaki)
• Less osund equals more ground.
• 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.
...

FMF - Powerbomb Header
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...

Pro Circuit - Ti-6 Titanium Exhaust Styem (Honda)
The Ti-6 Titanium Dual Exhaust System for the Honda is designed to improve performance and is constructed of titanium throughout the head pipe, y-collector mid pipe, and canisters while the end-caps are constructed of carbon fiber. Improving power where the Ti-5 showed...

FMF - Powercore 4 Slip-On Muffler (KTM):
FMF has designed this Powercore 4 Hex Slip-On exhaust muffler to help you get the most out of your KTM. By integrating key characteristics from their top of the line race exhausts, FMF is able to provide riders with an affordable, high quality...

FMF - Megabomb Header Stainless (Suzuki)
• FMF's latest power booster!
• Runs well with sound-restricting mufflers
• Effectively Reduces Sound Output by as much as 1.5dB
• Less Susceptible to Damage than a Long Header
• Produces the Low End of a Long Header and the Top End of...

FMF - Q4 Hex Slip-On Muffler (KTM)
• Less osund equals more ground.
• 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.
...

Pro Circuit- T-6 Stainless Exhaust System (Suzuki):
The Pro Circuit T-6 Stainless Exhaust System is designed to improve performance and is constructed of stainless steel throughout the head pipe, mid pipe, and end-cap for longetivity while the muffler canister is made of aluminum. Pro Circuit wanted to focus on improving...

Pro Circuit - Ti-6 Pro Titanium Exhaust System (Suzuki):
Pro Circuit's Ti-6 Pro Titanium Exhaust System was created for professional racers competing in a series such as AMA Supercross or AMA Motocross to ensure they pass AMA/FIM sound regulations. The Ti-6 Pro Titanium Exhaust System is constructed of titanium throughout...