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  • FMF Powercore 4 HEX Muffler 045666

    FMF Powercore 4 HEX Muffler 045666

    Powercore 4 HEX Muffler Overall increase in power and torque, Durable stainless steel and aluminum construction, Space Age internal packing material for maximum longevity, Internal shape of core uses Hi-Flo technology, Enhanced sonic evacuation provides...
    $400.95
  • FMF Powercore 2.1 Muffler - Aluminum 025278

    FMF Powercore 2.1 Muffler - Aluminum 025278

    Powercore 2.1 Muffler - Aluminum Built to provide excellent power for today’s tracks geared toward 4-stroke machines, Smooth power curve throughout the RPM range, Large diameter canister for more tenability and longer lasting packing life, Delivers a...
    $240.95
  • FMF Powercore 2.1 Muffler - Titanium 025279

    FMF Powercore 2.1 Muffler - Titanium 025279

    Powercore 2.1 Muffler - Titanium Built to create smooth, tractable power to help in the toughest conditions, Smooth power curve throughout the RPM range, Larger diameter titanium canister for more tunability and longer lasting packing life, The EXTREME...
    $450.95
  • FMF Factory 4.1 RCT Muffler - Aluminum 044464

    FMF Factory 4.1 RCT Muffler - Aluminum 044464

    Factory 4.1 RCT Muffler - Aluminum The Factory 4.1 RCT incorporates FMF's Resonance Chamber Technology™ both internally and externally, In addition, FMF achieves a shorter overall length that is less susceptible to crash damage and complementary to their...
    $675.95
  • FMF Q4 Muffler 043377

    FMF Q4 Muffler 043377

    Q4 Muffler Developed over years of championship off-road racing, Employs intricate chambers, baffles and proprietary multistage packing material, Max Sound output 96dB, Constructed from aircraft grade aluminum and high strength stainless steel, Use with...
    $450.95
  • FMF Factory 4.1 Muffler 042382

    FMF Factory 4.1 Muffler 042382

    Factory 4.1 Muffler Factory 4.1 muffler available in natural titanium or blue anodized titanium with titanium end caps, The lightest mufflers available, Superior power and performance - horsepower improved throughout the rpm range, Feature exclusive...
    $300.95
  • FMF Factory 4.1 Muffler 042396 FMF Factory 4.1 Muffler 042396

    FMF Factory 4.1 Muffler 042396

    Factory 4.1 Muffler RCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power output, Internal ducts in the chambers of the RCT system increase internal volume for improved exhaust flow,...
    $750.95
  • FMF Q4 Hex Slip-On Muffler 042393 FMF Q4 Hex Slip-On Muffler 042393

    FMF Q4 Hex Slip-On Muffler 042393

    Q4 Hex Slip-On Muffler Less sound equals more ground, Meets 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 U.S.A.
    $450.95
  • FMF Powercore 4 Muffler 041600

    FMF Powercore 4 Muffler 041600

    Powercore 4 Muffler Hi-Flo end cap boosts all-around performance, Computer-designed and dyno-tested for every 4-stroke application, Enhanced sonic evacuation delivers a higher flow of exhaust gases, which increases power, A stainless steel mid-pipe mates...
    $400.95
  • FMF Q4 Hex Slip-On Muffler 041601

    FMF Q4 Hex Slip-On Muffler 041601

    Q4 Hex Slip-On Muffler Less sound equals more ground, Meets 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 U.S.A.
    $450.95
  • FMF Factory 4.1 Muffler 041602

    FMF Factory 4.1 Muffler 041602

    Factory 4.1 Muffler The lightest mufflers available, Superior power and performance - horsepower improved throughout the rpm range, Feature exclusive proprietary Chamber Core technology, Factory Forward Engineering centralizes mass, improves handling,...
    $675.95
  • FMF Factory 4.1 Muffler 041603

    FMF Factory 4.1 Muffler 041603

    Factory 4.1 Muffler The lightest mufflers available, Superior power and performance - horsepower improved throughout the rpm range, Feature exclusive proprietary Chamber Core technology, Factory Forward Engineering centralizes mass, improves handling,...
    $900.95
  • FMF Q4 Hex Slip-On Muffler 043380

    FMF Q4 Hex Slip-On Muffler 043380

    Q4 Hex Slip-On Muffler Less sound equals more ground, Meets 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 U.S.A.
    $450.95
  • FMF Powercore 4 Hex Muffler 041608

    FMF Powercore 4 Hex Muffler 041608

    Powercore 4 Hex Muffler Overall increase in power and torque, Internal shape of core use Hi-Flo technology, Includes removable spark arrestor
    $400.95
  • FMF Powercore 2 Muffler 024079

    FMF Powercore 2 Muffler 024079

    Powercore 2 Muffler The Powercore 2 silencer provides a strong performance edge for any 2-stroke machine and the performance flow end cap and front stinger are stainless steel for unbeatable durability and an unmatched look, The lightweight extruded...
    $200.95
  • FMF Powercore 2 Shorty Muffler 024080

    FMF Powercore 2 Shorty Muffler 024080

    Powercore 2 Shorty Muffler Taking the proven success of the Powercore 2, the Powercore 2 Shorty has a shorter inner core length and aluminum canister resulting in a finely tuned bolt on performance silencer that maximizes bottom and mid rpm power, An...
    $200.95
  • FMF Powercore 4 Exhaust 041178

    FMF Powercore 4 Exhaust 041178

    Powercore 4 Exhaust Hi-Flo end cap boosts all-around performance, Computer designed and dyno-tested for every 4-stroke application, Enhanced sonic evacuation delivers a higher flow of exhaust gases, which increases power, A stainless steel mid-pipe mates...
    $280.95
  • FMF Gnarly Pipe 025087

    FMF Gnarly Pipe 025087

    Gnarly Pipe The FMF Gnarly pipe focuses on increasing the lower RPM horsepower and torque to get you out of the toughest terrain, When looking to add 4-stroke tractor like torque to your 2-stroke and you need a pipe to withstand the harsh elements, this...
    $330.95
  • FMF Fatty Pipe 025088

    FMF Fatty Pipe 025088

    Fatty Pipe Computer designed and dyno tested to make power gains where each machine needs them the most, Tru-Flo stamping process ensures a perfect fit and optimum performance, Constructed of strong 19-gauge steel with a nickel-plated finish
    $300.95
  • FMF Factory Fatty Pipe 025090

    FMF Factory Fatty Pipe 025090

    Factory Fatty Pipe The Factory Fatty is reminiscent of the “works” or cone pipe once used by Factory Teams and it shares many of the same characteristics with its craftsmanship and material quality, Broadens and smooths out the power curve while boosting...
    $300.95
  • FMF Gnarly Pipe 025095

    FMF Gnarly Pipe 025095

    Gnarly Pipe The FMF Gnarly pipe focuses on increasing the lower RPM horsepower and torque to get you out of the toughest terrain, When looking to add 4-stroke tractor like torque to your 2-stroke and you need a pipe to withstand the harsh elements, this...
    $300.95
  • FMF Powercore 4 Exhaust 041501 FMF Powercore 4 Exhaust 041501

    FMF Powercore 4 Exhaust 041501

    Powercore 4 Exhaust Hi-Flo end cap boosts all-around performance, Computer designed and dyno-tested for every 4-stroke application, Enhanced sonic evacuation delivers a higher flow of exhaust gases, which increases power, A stainless steel mid-pipe mates...
    $280.95
  • FMF Fatty Pipe 022060

    FMF Fatty Pipe 022060

    Fatty Pipe Computer designed and dyno tested to make power gains where each machine needs them the most, Tru-Flo stamping process ensures a perfect fit and optimum performance, Constructed of strong 19-gauge steel with a nickel-plated finish
    $300.95
  • FMF 4.1 RCT Slip-On Muffler 045690

    FMF 4.1 RCT Slip-On Muffler 045690

    4.1 RCT Slip-On Muffler The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally, Shorter overall length that is less susceptible to crash damage, moving the muffler closer to the motor to centralize...
    $900.95
  • FMF PowerBomb Header 041118

    FMF PowerBomb Header 041118

    PowerBomb Header Utilize FMF's patented module precisely located at the initial stage of the header, Position "Bomb" increases performance; horsepower is increased as much as 10%, Act as "pre-muffler" helping to lower the decibel output, The expansion...
    $250.95
  • FMF PowerBomb Header 044225

    FMF PowerBomb Header 044225

    PowerBomb Header Utilize FMF's patented module precisely located at the initial stage of the header, Position "Bomb" increases performance; horsepower is increased as much as 10%, Act as "pre-muffler" helping to lower the decibel output, The expansion...
    $250.95
  • FMF PowerBomb Header 043289

    FMF PowerBomb Header 043289

    PowerBomb Header Utilize FMF's patented module precisely located at the initial stage of the header, Position "Bomb" increases performance; horsepower is increased as much as 10%, Act as "pre-muffler" helping to lower the decibel output, The expansion...
    $250.95
  • FMF Fatty Pipe 024068

    FMF Fatty Pipe 024068

    Fatty Pipe Computer designed and dyno tested to make power gains where each machine needs them the most, Tru-Flo stamping process ensures a perfect fit and optimum performance, Constructed of strong 19-gauge steel with a nickel-plated finish
    $290.95
  • FMF PowerBomb Header 041483

    FMF PowerBomb Header 041483

    PowerBomb Header Utilize FMF's patented module precisely located at the initial stage of the header, Position "Bomb" increases performance; horsepower is increased as much as 10%, Act as "pre-muffler" helping to lower the decibel output, The expansion...
    $200.95
  • FMF MegaBomb Header - Stainless Steel 042343

    FMF MegaBomb Header - Stainless Steel 042343

    MegaBomb Header - Stainless Steel The ultimate power booster, Improved bottom to mid-range power, Less susceptible to damage than a longer header, Effectively reduces sound output by as much as 1.5 dB, Runs well with sound restricting mufflers
    $375.95
  • FMF PowerBomb Header 041583

    FMF PowerBomb Header 041583

    PowerBomb Header Utilize FMF's patented module precisely located at the initial stage of the header, Position "Bomb" increases performance; horsepower is increased as much as 10%, Act as "pre-muffler" helping to lower the decibel output, The expansion...
    $250.95
  • FMF 4.1 RCT Exhaust with MegaBomb - Anodized Titanium 044457

    FMF 4.1 RCT Exhaust with MegaBomb - Anodized Titanium 044457

    4.1 RCT Exhaust with MegaBomb - Anodized Titanium The Factory 4.1 RCT incorporates FMF Resonance Chamber Technology™ both internally and externally, Shorter overall length that is less susceptible to crash damage and complementary to FMF's Factory...
    $1,375.95
  • FMF MegaBomb Header 045659

    FMF MegaBomb Header 045659

    MegaBomb Header The ultimate power booster, Improved bottom to mid-range power, Produce the low end of a longer header and the top end of a short header, Less susceptible to damage than a long header, Effectively reduces sound output by as much as 1.5...
    $475.95
  • FMF PowerBomb Header 042385

    FMF PowerBomb Header 042385

    PowerBomb Header Utilize FMF's patented module precisely located at the initial stage of the header, Position "Bomb" increases performance; horsepower is increased as much as 10%, Act as "pre-muffler" helping to lower the decibel output, The expansion...
    $250.95
  • FMF MegaBomb Header 042390

    FMF MegaBomb Header 042390

    MegaBomb Header The ultimate power booster featuring exclusive Ti-Metal construction, Improved bottom to mid-range power, Produce the low end of a longer header and the top end of a short header, Less susceptible to damage than a long header, Runs well...
    $375.95
  • FMF 4.1 RCT Exhaust with MegaBomb - Aluminum 045638

    FMF 4.1 RCT Exhaust with MegaBomb - Aluminum 045638

    4.1 RCT Exhaust with MegaBomb - Aluminum The Factory 4.1 RCT incorporates FMF Resonance Chamber Technology™ both internally and externally, Shorter overall length that is less susceptible to crash damage and complementary to FMF's Factory Forward...
    $1,050.95
  • FMF Factory 4.1 RCT Exhaust - Aluminum 042397

    FMF Factory 4.1 RCT Exhaust - Aluminum 042397

    Factory 4.1 RCT Exhaust - Aluminum RCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power output, Internal ducts in the chambers of the RCT system increase internal volume for improved...
    $975.95
  • FMF 4.1 RCT Exhaust System 041612

    FMF 4.1 RCT Exhaust System 041612

    4.1 RCT Exhaust System The Factory 4.1 RCT incorporates the FMF Resonance Chamber Technology™ both internally and externally, In addition, we achieve a shorter overall length that is less susceptible to crash damage and complementary to our Factory...
    $1,050.95
  • FMF Gold Series Fatty™ Pipe 025297 FMF Gold Series Fatty™ Pipe 025297

    FMF Gold Series Fatty™ Pipe 025297

    Gold Series Fatty™ Pipe More tractable power, improved throttle control, Carbon steel with a nickel plated finish for maximum durability, FMF Racing’s Tru-Flo stamping process ensures a perfect fit and optimum performance, O-Rings included
    $330.95

Exhaust Systems

Motorcycle & Powersports Exhaust Systems

An aftermarket exhaust system is one of the most rewarding upgrades you can make to any motorcycle. The power gains are real and immediate. The weight reduction is meaningful. The sound is something you hear and feel on every ride from the moment you start the engine. But beyond the performance and the experience, an aftermarket exhaust is also one of the most visible expressions of how you have built your machine and what you want it to say about you as a rider. From a lightweight titanium two-stroke expansion chamber on a race-prepped motocross bike to a deep-throated slip-on on a streetfighter or a full performance system on an adventure tourer, the exhaust is the modification that defines the character of a build as much as anything else on the machine.

Mad Lads Moto stocks exhaust systems and exhaust components for dirt bikes, motocross bikes, enduro machines, street bikes, adventure tourers, and dual sport motorcycles. We carry full exhaust systems that replace everything from the header to the muffler, slip-on mufflers that bolt onto the existing mid-pipe for a simpler upgrade, two-stroke expansion chambers, headers and mid-pipes, and all of the exhaust accessories needed to complete an installation or maintain an existing system. Here is how we have organized the section to make finding the right exhaust straightforward:

  • Full Exhaust Systems - Complete header-back exhaust systems that replace the entire OEM exhaust from the head pipe through the muffler, delivering the maximum power gains, the most significant weight reduction, and the most dramatic change in exhaust character of any exhaust upgrade option.
  • Slip-On Mufflers - Bolt-on muffler replacements that attach to the existing OEM or aftermarket mid-pipe for a simpler installation with a meaningful improvement in sound and a moderate power gain at a lower cost than a full system.
  • 2-Stroke Expansion Chambers - Tuned expansion chamber pipes for two-stroke dirt bikes and motocross bikes where the exhaust pipe is a fundamental part of the engine's power delivery system and selection directly affects where in the RPM range power comes on and how broadly it is delivered.
  • Headers & Pipes - Replacement and performance header pipes and mid-pipes that improve exhaust flow from the cylinder head and form the foundation of a performance exhaust build, available individually for riders building a custom exhaust combination.
  • Gaskets, Shields & Hardware - Exhaust gaskets, heat shields, exhaust springs, mounting hardware, end caps, quiet cores, spark arrestors, and all of the accessories needed to complete an exhaust installation cleanly and maintain an existing system over time.

Choosing the right exhaust for your machine and your riding style requires understanding a few key concepts that make the difference between an upgrade that transforms your ride and one that delivers less than you expected. Full exhaust systems deliver the best power gains because they address the restrictive factory header pipe as well as the muffler. Slip-on mufflers are easier to install and cost less but leave the restrictive stock header in place, limiting how much power the upgrade can unlock. On four-stroke bikes, pairing any exhaust upgrade with a fuel management device or ECU flash ensures the fuel delivery matches the new airflow and maximizes the power gain while protecting the engine from running lean. On two-stroke bikes, exhaust selection affects power delivery characteristics as much as peak output, and matching the pipe to your riding style is as important as matching it to your engine. Spark arrestor requirements apply on most public lands and national forests in the United States, and confirming that any exhaust system you purchase either includes a USFS-approved spark arrestor or is compatible with one is essential before riding on public land. We stock exhaust systems and components for Honda, Yamaha, Kawasaki, Suzuki, KTM, Husqvarna, Beta, GasGas, and more. Use our year, make, and model fitment tool to find exhaust systems confirmed to fit your specific machine before you order.

What exhaust upgrade will give me the most power on my four-stroke dirt bike?

A full exhaust system combined with a fuel management tune delivers the most power of any exhaust upgrade on a four-stroke dirt bike. The full system addresses both the restrictive factory header pipe and the muffler, improving exhaust flow throughout the entire system rather than just at the muffler end. Pairing the exhaust with a fuel tuner or ECU flash calibrated for the specific exhaust recalibrates fuel delivery to match the improved airflow and unlocks the full power potential of the exhaust upgrade. A slip-on muffler alone delivers a moderate power improvement and a noticeable change in exhaust note but leaves the stock header in place, limiting the overall gain compared to a full system. For riders who want maximum performance from their exhaust upgrade, a full system with a matched fuel tune is the correct combination. For riders who want a meaningful improvement at a lower cost and with simpler installation, a quality slip-on from a reputable manufacturer delivers good value.

Do I need a spark arrestor on my dirt bike exhaust and where is it required?

A USFS-approved spark arrestor is required on most public lands managed by the United States Forest Service, Bureau of Land Management, and many state-managed OHV areas across the country. The requirement applies to all off-road vehicles including dirt bikes, ATVs, and UTVs operating on those lands regardless of whether the exhaust is stock or aftermarket. Many aftermarket exhaust systems designed for off-road use include an integrated spark arrestor that meets USFS requirements. Systems that do not include a spark arrestor are typically compatible with aftermarket spark arrestors that install in the end of the muffler. Before purchasing any aftermarket exhaust for a machine that will be ridden on public land, confirm that the system either includes a USFS-approved spark arrestor or specifies which aftermarket spark arrestors are compatible with that specific muffler. Riding on public land without a required spark arrestor can result in significant fines and in some cases confiscation of the machine.

How do I choose between a full exhaust system and a slip-on muffler for my motorcycle?

The decision between a full exhaust system and a slip-on muffler comes down to your performance goals, your budget, and how much installation complexity you want to take on. A full exhaust system replaces the header, mid-pipe if applicable, and muffler for maximum power gains, the most significant weight reduction, and the most dramatic change in exhaust note. It requires more installation time and costs more upfront but delivers results that a slip-on cannot match. A slip-on muffler replaces only the muffler while retaining the stock header and mid-pipe. Installation is straightforward on most bikes, cost is lower, the exhaust note improvement is immediate and noticeable, and the power gain is real if modest compared to a full system. For riders who want the best possible performance and are building the bike seriously, a full system is the right investment. For riders who want an improved exhaust note, a small power gain, and a weight reduction without the cost and complexity of a full system, a slip-on from a quality manufacturer is a smart and satisfying upgrade.
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