Dirt Bike Exhaust

Dirt Bike Exhaust

Dirt Bike Exhaust

We offer a wide range of dirt bike exhausts such as full complete exhaust systems, silencers, pipes, and exhaust accessories from major brands in the industry: Bill’s Pipes, FMF, Pro Circuit, and more!

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  • KHROME WERKS 2:2 Exhaust with 4.5" Muffler - Chrome - FL 200400A

    KHROME WERKS 2:2 Exhaust with 4.5" Muffler - Chrome - FL 200400A

    KHROME WERKS

    $1,699.95
    KHROME WERKS 2:2 Exhaust with 4.5" Muffler Chrome FL 200400AEnlarged interconnected headers make for improved horsepower and low-end torque, 1.75” to 1.875” high-flow 16-gauge stepped primary headers, Features full 2” left side crossover and 4.5” muffler...
    18002175
    SKU:
    18002175
    Availability:
    Ships Same Business Day
    Weight:
    54.00 LBS
    DESIGN/CONFIGURATION:
    2-INTO-2 SYSTEM
    OXYGEN SENSOR:
    12 MM
    END CAP STYLE:
    TRACER
    MUFFLER DIAMETER IMPERIAL:
    4-1/2'
    PRODUCT NAME:
    EXHAUST SYSTEM
    UNITS:
    EACH
    MODEL:
    DOMINATOR
    MUFFLER STYLE:
    STRAIGHT CAN
    COLOR/FINISH:
    CHROME
    END CAP COLOR/FINISH:
    BLACK
    OXYGEN SENSOR:
    18 MM
    RIDING STYLE:
    STREET
    $1,699.95
    Qty in Cart: 0
    Quantity:
    Price:
    $1,699.95
    Subtotal:
  • KHROME WERKS 2:2 Exhaust with 4.5" Muffler - Black - FL 200810A KHROME WERKS 2:2 Exhaust with 4.5" Muffler - Black - FL 200810A

    KHROME WERKS 2:2 Exhaust with 4.5" Muffler - Black - FL 200810A

    KHROME WERKS

    $1,799.95
    KHROME WERKS 2:2 Exhaust with 4.5" Muffler Black FL 200810AEnlarged interconnected headers make for improved horsepower and low-end torque, 1.75” to 1.875” high-flow 16-gauge stepped primary headers, Features full 2” left side crossover and 4.5” muffler...
    18002176
    SKU:
    18002176
    Availability:
    Ships Same Business Day
    Weight:
    56.90 LBS
    COLOR/FINISH:
    BLACK
    DESIGN/CONFIGURATION:
    2-INTO-2 SYSTEM
    END CAP STYLE:
    TRACER
    UNITS:
    EACH
    END CAP COLOR/FINISH:
    BLACK
    OXYGEN SENSOR:
    12 MM
    OXYGEN SENSOR:
    18 MM
    PRODUCT NAME:
    EXHAUST SYSTEM
    RIDING STYLE:
    STREET
    MODEL:
    DOMINATOR
    MUFFLER DIAMETER IMPERIAL:
    4-1/2'
    MUFFLER STYLE:
    STRAIGHT CAN
    $1,799.95
    Qty in Cart: 0
    Quantity:
    Price:
    $1,799.95
    Subtotal:
  • KHROME WERKS 2:2 Exhaust with 4.5" Muffler - Eclipse - FL 201810A

    KHROME WERKS 2:2 Exhaust with 4.5" Muffler - Eclipse - FL 201810A

    KHROME WERKS

    $1,899.95
    KHROME WERKS 2:2 Exhaust with 4.5" Muffler Eclipse FL 201810AEnlarged interconnected headers make for improved horsepower and low-end torque, 1.75” to 1.875” high-flow 16-gauge stepped primary headers, Features full 2” left side crossover and 4.5”...
    18002177
    SKU:
    18002177
    Availability:
    Ships Same Business Day
    Weight:
    56.00 LBS
    MUFFLER STYLE:
    STRAIGHT CAN
    OXYGEN SENSOR:
    12 MM
    END CAP STYLE:
    TRACER
    MODEL:
    DOMINATOR
    MUFFLER DIAMETER IMPERIAL:
    4-1/2'
    PRODUCT NAME:
    EXHAUST SYSTEM
    RIDING STYLE:
    STREET
    COLOR/FINISH:
    BLACK
    COLOR/FINISH:
    ECLIPSE
    DESIGN/CONFIGURATION:
    2-INTO-2 SYSTEM
    END CAP COLOR/FINISH:
    BLACK
    OXYGEN SENSOR:
    18 MM
    UNITS:
    EACH
    $1,899.95
    Qty in Cart: 0
    Quantity:
    Price:
    $1,899.95
    Subtotal:
  • KHROME WERKS Mufflers - Chrome with Tracer Tip 202790

    KHROME WERKS Mufflers - Chrome with Tracer Tip 202790

    KHROME WERKS

    $789.95
    KHROME WERKS Mufflers Chrome with Tracer Tip 202790Engineered for performance, style and sound, Produce the Khrome Werks signature, authoritative tone without annoying high-frequency noises, Improved torque and horsepower from the hit of the throttle,...
    18011286
    SKU:
    18011286
    Availability:
    Ships Same Business Day
    Weight:
    25.20 LBS
    BASE FINISH:
    CHROME
    END CAP COLOR/FINISH:
    BLACK
    MODEL:
    HP-PLUS
    OUTER DIAMETER IMPERIAL:
    4-1/2'
    PRODUCT NAME:
    MUFFLER
    UNITS:
    PAIR
    END CAP STYLE:
    TRACER
    MUFFLER COLOR/FINISH:
    CHROME
    STYLE:
    ROUND
    TYPE:
    SLIP-ON
    COLOR/FINISH:
    CHROME
    RIDING STYLE:
    STREET
    $789.95
    Qty in Cart: 0
    Quantity:
    Price:
    $789.95
    Subtotal:
  • KHROME WERKS 4.5" Klassic End Cap - Right 200659P KHROME WERKS 4.5" Klassic End Cap - Right 200659P

    KHROME WERKS 4.5" Klassic End Cap - Right 200659P

    KHROME WERKS

    $129.95
    KHROME WERKS 4.5" Klassic End Cap Right 200659PCan be rotated 360° at 90° increments, Nickel sealed and features a high-temp black powdercoated finish, Fits all 4.5" Khrome Werks mufflers that accept billet aluminum tips, Machined in America
    18611453
    SKU:
    18611453
    Availability:
    Ships Same Business Day
    Weight:
    1.25 LBS
    COLOR/FINISH:
    POWDER-COATED
    OUTSIDE DIAMETER IMPERIAL:
    4-1/2'
    PRODUCT NAME:
    TIP
    RIDING STYLE:
    STREET
    STYLE:
    RIGHT
    UNITS:
    EACH
    COLOR/FINISH:
    BLACK
    END CAP STYLE:
    KLASSIC
    MATERIAL:
    BILLET ALUMINUM
    TYPE:
    EXHAUST
    $129.95
    Qty in Cart: 0
    Quantity:
    Price:
    $129.95
    Subtotal:
  • KHROME WERKS Endcap - Chrome 200719P KHROME WERKS Endcap - Chrome 200719P

    KHROME WERKS Endcap - Chrome 200719P

    KHROME WERKS

    $129.95
    KHROME WERKS Endcap Chrome 200719PFits all 4.5" Khrome Werks mufflers
    18611537
    SKU:
    18611537
    Availability:
    Ships Same Business Day
    Weight:
    1.25 LBS
    COLOR/FINISH:
    CHROME
    PRODUCT NAME:
    END CAP
    RIDING STYLE:
    STREET
    UNITS:
    EACH
    COLOR/FINISH:
    CHROME EDGE
    END CAP STYLE:
    SLASH-CUT
    TYPE:
    EXHAUST
    $129.95
    Qty in Cart: 0
    Quantity:
    Price:
    $129.95
    Subtotal:
  • KHROME WERKS 4.5" Mufflers for Touring - Chrome with Tracer 202735

    KHROME WERKS 4.5" Mufflers for Touring - Chrome with Tracer 202735

    KHROME WERKS

    $789.95
    KHROME WERKS 4.5" Mufflers for Touring Chrome with Tracer 202735These mufflers have been dyno tested and show a 12% increase in torque and 7% increase in power, Produce the Khrome Werks signature, authoritative tone without annoying high-frequency...
    18011259
    SKU:
    18011259
    Availability:
    Ships Same Business Day
    Weight:
    24.40 LBS
    BASE COLOR:
    SILVER
    END CAP COLOR/FINISH:
    MACHINED
    BASE FINISH:
    CHROME
    END CAP COLOR/FINISH:
    BLACK
    MODEL:
    HP-PLUS
    OUTER DIAMETER IMPERIAL:
    4-1/2'
    PRODUCT NAME:
    MUFFLER
    UNITS:
    PAIR
    END CAP STYLE:
    TRACER
    MUFFLER COLOR/FINISH:
    CHROME
    STYLE:
    STRAIGHT CAN
    TYPE:
    SLIP-ON
    COLOR/FINISH:
    CHROME
    END CAP COLOR/FINISH:
    SILVER
    RIDING STYLE:
    STREET
    $789.95
    Qty in Cart: 0
    Quantity:
    Price:
    $789.95
    Subtotal:
  • KHROME WERKS 2:2 Exhaust - Chrome - '09-'16 FL 200630 KHROME WERKS 2:2 Exhaust - Chrome - '09-'16 FL 200630

    KHROME WERKS 2:2 Exhaust - Chrome - '09-'16 FL 200630

    KHROME WERKS

    $1,699.95
    KHROME WERKS 2:2 Exhaust Chrome '09-'16 FL 2006301.75” to 1.875” high-flow 16-gauge stepped primary headers with an obround 1.875” crossover, 4”-diameter, 16-gauge absorptive mufflers with 2” inlets and removable billet tips, 2.50,” 220°, 16-gauge heat...
    18001959
    SKU:
    18001959
    Availability:
    Ships Same Business Day
    Weight:
    53.50 LBS
    $1,699.95
    Qty in Cart: 0
    Quantity:
    Price:
    $1,699.95
    Subtotal:
  • KHROME WERKS Exhaust Clamp - Stainless Steel 203032

    KHROME WERKS Exhaust Clamp - Stainless Steel 203032

    KHROME WERKS

    $39.95
    KHROME WERKS Exhaust Clamp Stainless Steel 203032Feature a 1.25" wide stainless band with an exclusive reaction block for 360° clamping without muffler or header distortion, High-strength fastener hardware with corrosion-resistant coating included, Made...
    18601382
    SKU:
    18601382
    Availability:
    Ships Same Business Day
    Weight:
    0.95 LBS
    UNITS:
    PAIR
    CLAMPING DIAMETER IMPERIAL:
    2'
    MATERIAL:
    STAINLESS STEEL
    PRODUCT NAME:
    CLAMP
    TYPE:
    EXHAUST CLAMP
    COLOR/FINISH:
    UNFINISHED
    RIDING STYLE:
    STREET
    $39.95
    Qty in Cart: 0
    Quantity:
    Price:
    $39.95
    Subtotal:
  • KHROME WERKS Mufflers - Black with Edge Tip 202855

    KHROME WERKS Mufflers - Black with Edge Tip 202855

    KHROME WERKS

    $819.95
    KHROME WERKS Mufflers Black with Edge Tip 202855Engineered for performance, style and sound, Produce the Khrome Werks signature, authoritative tone without annoying high-frequency noises, Improved torque and horsepower from the hit of the throttle,...
    18011448
    SKU:
    18011448
    Availability:
    Ships Same Business Day
    Weight:
    25.30 LBS
    MUFFLER COLOR/FINISH:
    BLACK
    END CAP COLOR/FINISH:
    BLACK
    MODEL:
    HP-PLUS
    OUTER DIAMETER IMPERIAL:
    4-1/2'
    PRODUCT NAME:
    MUFFLER
    UNITS:
    PAIR
    BASE COLOR:
    BLACK
    END CAP STYLE:
    EDGE
    STYLE:
    ROUND
    TYPE:
    SLIP-ON
    COLOR/FINISH:
    BLACK
    RIDING STYLE:
    STREET
    $819.95
    Qty in Cart: 0
    Quantity:
    Price:
    $819.95
    Subtotal:
  • KHROME WERKS 4.5" Mufflers for Touring - Black with Turbine 202870

    KHROME WERKS 4.5" Mufflers for Touring - Black with Turbine 202870

    KHROME WERKS

    $819.95
    KHROME WERKS 4.5" Mufflers for Touring Black with Turbine 202870These mufflers have been dyno tested and show a 12% increase in torque and 7% increase in power, Produce the Khrome Werks signature, authoritative tone without annoying high-frequency...
    18011256
    SKU:
    18011256
    Availability:
    Ships Same Business Day
    Weight:
    24.60 LBS
    COLOR/FINISH:
    BLACK
    END CAP COLOR/FINISH:
    BLACK
    END CAP COLOR/FINISH:
    SILVER
    RIDING STYLE:
    STREET
    BASE COLOR:
    BLACK
    TYPE:
    SLIP-ON
    COLOR/FINISH:
    SATIN
    END CAP STYLE:
    TURBINE
    OUTER DIAMETER IMPERIAL:
    4-1/2'
    STYLE:
    STRAIGHT CAN
    UNITS:
    PAIR
    BASE FINISH:
    SATIN
    END CAP COLOR/FINISH:
    MACHINED
    MODEL:
    HP-PLUS
    MUFFLER COLOR/FINISH:
    BLACK
    PRODUCT NAME:
    MUFFLER
    $819.95
    Qty in Cart: 0
    Quantity:
    Price:
    $819.95
    Subtotal:
  • KHROME WERKS 1.75" HP-Plus Baffles 202012

    KHROME WERKS 1.75" HP-Plus Baffles 202012

    KHROME WERKS

    $98.95
    KHROME WERKS 1.75" HP-Plus Baffles 202012These HP-Plus® drag baffles improve low and mid-range performance of drag pipes while also dampening sound, All steel construction, Mounting hardware included, Made in the USA
    DS202012
    SKU:
    DS202012
    Availability:
    Ships Same Business Day
    Weight:
    1.13 LBS
    INSIDE DIAMETER IMPERIAL:
    1-3/4'
    PRODUCT NAME:
    BAFFLE
    RIDING STYLE:
    STREET
    MATERIAL:
    STEEL
    MODEL:
    HP-PLUS
    UNITS:
    PAIR
    $98.95
    Qty in Cart: 0
    Quantity:
    Price:
    $98.95
    Subtotal:
  • KHROME WERKS 2:2 Exhaust with 4.5" Muffler - Black - FL 200445

    KHROME WERKS 2:2 Exhaust with 4.5" Muffler - Black - FL 200445

    KHROME WERKS

    $1,799.95
    KHROME WERKS 2:2 Exhaust with 4.5" Muffler Black FL 200445Enlarged interconnected headers make for improved horsepower and low-end torque, 1.75” to 1.875” high-flow 16-gauge stepped primary headers, Features full 2” left side crossover and 4.5” muffler...
    18002481
    SKU:
    18002481
    Availability:
    Ships Same Business Day
    Weight:
    54.90 LBS
    COLOR/FINISH:
    BLACK
    DESIGN/CONFIGURATION:
    2-INTO-2 SYSTEM
    END CAP STYLE:
    EDGE
    OXYGEN SENSOR:
    12 MM
    BASE COLOR:
    BLACK
    BASE FINISH:
    MATTE
    MUFFLER DIAMETER IMPERIAL:
    4-1/2'
    PRODUCT NAME:
    EXHAUST SYSTEM
    STYLE:
    STRAIGHT
    MUFFLER STYLE:
    STRAIGHT CAN
    END CAP COLOR/FINISH:
    BLACK
    OXYGEN SENSOR:
    18 MM
    RIDING STYLE:
    STREET
    UNITS:
    EACH
    $1,799.95
    Qty in Cart: 0
    Quantity:
    Price:
    $1,799.95
    Subtotal:
  • KHROME WERKS Replacement Headpipe 200100 KHROME WERKS Replacement Headpipe 200100

    KHROME WERKS Replacement Headpipe 200100

    KHROME WERKS

    $499.95
    KHROME WERKS Replacement Headpipe 20010016 gauge 1-3/4” primaries, 2.5” collector, 18mm and 12mm O2 bungs, flexible tuning, Fits directly under factory heat shields, Mounts with factory hardware and crossover, Significantly reduced heat footprint,...
    18020400
    SKU:
    18020400
    Availability:
    Ships Same Business Day
    Weight:
    10.90 LBS
    MODEL:
    HIDEAWAY
    UNITS:
    EACH
    COLOR/FINISH:
    NICKEL CHROME
    RIDING STYLE:
    STREET
    DESIGN/CONFIGURATION:
    2-INTO-2 SYSTEM
    PRODUCT NAME:
    HEADER
    $499.95
    Qty in Cart: 0
    Quantity:
    Price:
    $499.95
    Subtotal:
  • KHROME WERKS Exhaust Clamp - Stainless Steel 203031

    KHROME WERKS Exhaust Clamp - Stainless Steel 203031

    KHROME WERKS

    $36.95
    KHROME WERKS Exhaust Clamp Stainless Steel 203031Feature a 1.25" wide stainless band with an exclusive reaction block for 360° clamping without muffler or header distortion, High-strength fastener hardware with corrosion-resistant coating included, Made...
    18601383
    SKU:
    18601383
    Availability:
    Ships Same Business Day
    Weight:
    0.95 LBS
    CLAMPING DIAMETER IMPERIAL:
    1-3/4' - 2'
    UNITS:
    PAIR
    COLOR/FINISH:
    UNFINISHED
    RIDING STYLE:
    STREET
    MATERIAL:
    STAINLESS STEEL
    PRODUCT NAME:
    CLAMP
    TYPE:
    EXHAUST CLAMP
    $36.95
    Qty in Cart: 0
    Quantity:
    Price:
    $36.95
    Subtotal:
  • KHROME WERKS 4.5" Mufflers for Touring - Chrome with Klassic 202725

    KHROME WERKS 4.5" Mufflers for Touring - Chrome with Klassic 202725

    KHROME WERKS

    $789.95
    KHROME WERKS 4.5" Mufflers for Touring Chrome with Klassic 202725These mufflers have been dyno tested and show a 12% increase in torque and 7% increase in power, Produce the Khrome Werks signature, authoritative tone without annoying high-frequency...
    18011139
    SKU:
    18011139
    Availability:
    Ships Same Business Day
    Weight:
    26.00 LBS
    BASE FINISH:
    CHROME
    MODEL:
    HP-PLUS
    OUTER DIAMETER IMPERIAL:
    4-1/2'
    PRODUCT NAME:
    MUFFLER
    UNITS:
    PAIR
    BASE COLOR:
    SILVER
    END CAP COLOR/FINISH:
    MACHINED
    END CAP STYLE:
    KLASSIC
    MUFFLER COLOR/FINISH:
    CHROME
    STYLE:
    STRAIGHT CAN
    TYPE:
    SLIP-ON
    COLOR/FINISH:
    CHROME
    END CAP COLOR/FINISH:
    BLACK
    END CAP COLOR/FINISH:
    SILVER
    RIDING STYLE:
    STREET
    $789.95
    Qty in Cart: 0
    Quantity:
    Price:
    $789.95
    Subtotal:
  • KHROME WERKS Mufflers - Slashcut 202395

    KHROME WERKS Mufflers - Slashcut 202395

    KHROME WERKS

    $449.95
    KHROME WERKS Mufflers Slashcut 202395Patented steel construction baffle now features more high-temperature fiberglass packing, provides significant gains in horsepower and torque and exhibits a distinctive, throaty sound, Use all factory mounting...
    18010693
    SKU:
    18010693
    Availability:
    Ships Same Business Day
    Weight:
    10.70 LBS
    BASE FINISH:
    CHROME
    OUTER DIAMETER IMPERIAL:
    3'
    STYLE:
    ROUND
    UNITS:
    PAIR
    STYLE:
    BOLOGNA
    MATERIAL:
    STEEL
    TYPE:
    SLIP-ON
    COLOR/FINISH:
    CHROME
    END CAP STYLE:
    SLASH-CUT
    MODEL:
    HP-PLUS
    PRODUCT NAME:
    MUFFLER
    RIDING STYLE:
    STREET
    $449.95
    Qty in Cart: 0
    Quantity:
    Price:
    $449.95
    Subtotal:
  • KHROME WERKS Mufflers - Black with Tracer Tip 202840

    KHROME WERKS Mufflers - Black with Tracer Tip 202840

    KHROME WERKS

    $819.95
    KHROME WERKS Mufflers Black with Tracer Tip 202840Engineered for performance, style and sound, Produce the Khrome Werks signature, authoritative tone without annoying high-frequency noises, Improved torque and horsepower from the hit of the throttle,...
    18011287
    SKU:
    18011287
    Availability:
    Ships Same Business Day
    Weight:
    25.70 LBS
    COLOR/FINISH:
    BLACK
    END CAP COLOR/FINISH:
    BLACK
    MODEL:
    HP-PLUS
    PRODUCT NAME:
    MUFFLER
    UNITS:
    PAIR
    BASE COLOR:
    BLACK
    END CAP STYLE:
    TRACER
    MUFFLER COLOR/FINISH:
    BLACK
    RIDING STYLE:
    STREET
    OUTER DIAMETER IMPERIAL:
    4-1/2'
    STYLE:
    ROUND
    TYPE:
    SLIP-ON
    $819.95
    Qty in Cart: 0
    Quantity:
    Price:
    $819.95
    Subtotal:
  • KHROME WERKS Replacement Louvered Baffles 202712P

    KHROME WERKS Replacement Louvered Baffles 202712P

    KHROME WERKS

    $103.95
    KHROME WERKS Replacement Louvered Baffles 202712PUnleash your beast with Khrome Werks performance Insert for 4" HP-Plus mufflers, HP-Plus baffles emit a deep, mellow exhaust tone that is adjustable by simply changing an insert held into the baffle by two...
    18601818
    SKU:
    18601818
    Availability:
    Ships Same Business Day
    Weight:
    3.40 LBS
    RIDING STYLE:
    STREET
    STYLE:
    LOUVERED
    PRODUCT NAME:
    INSERT KIT
    UNITS:
    PAIR
    $103.95
    Qty in Cart: 0
    Quantity:
    Price:
    $103.95
    Subtotal:
  • KHROME WERKS Insert for 4.5" HP-Plus Slip-On Muffler 202713P

    KHROME WERKS Insert for 4.5" HP-Plus Slip-On Muffler 202713P

    KHROME WERKS

    $89.95
    KHROME WERKS Insert for 4.5" HP-Plus Slip-On Muffler 202713PBolt-in optional insert, No appreciable loss of performance
    18011143
    SKU:
    18011143
    Availability:
    Ships Same Business Day
    Weight:
    1.65 LBS
    PRODUCT NAME:
    INSERT
    RIDING STYLE:
    STREET
    TYPE:
    QUIET INSERT
    UNITS:
    PAIR
    $89.95
    Qty in Cart: 0
    Quantity:
    Price:
    $89.95
    Subtotal:
  • Total: items /

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Dirt Bike Exhausts

Enhance the performance of your dirt bike with an exhaust upgrade from JJ Motorsports. Our collection has a surplus of quality 2-stroke and 4-stroke systems, offering budget friendly options to suit riders at all levels - whether you're just starting out or have been riding like a pro for years! With industry leading brands available, we can help make sure your ride is as powerful and efficient as ever.

 

Dirt Bike Exhaust Performance

Upgrading your dirt bike's exhaust system is an upgrade with incredible benefits. You'll feel the power of increased horsepower for a faster ride, as well as notice weight reduction due to improved materials used in the new pipes. And don't forget that sound! Experience beauty you can both see and hear - it will take any average rider up a level into pro-style performance on their rides. Finding out which model best suits such needs? No problem: JJ Motorsports gearheads know all there is about these systems and they are more than ready to help make sure yours fits like glove - not just selecting among slip-on or full versions but also guaranteeing your riding experience through extra accessories like pipe guards, plugs and packing mixtures when needed.

 

2-Stroke MX Exhausts | 4-Stroke MX Exhausts

At JJ Motorsports, we offer the best dirt bike exhaust systems from top brands to ensure your ride has maximum performance. Choose between a slip-on for 4-stroke engines or replacement silencers and complete systems for 2-strokes that will keep you at full speed no matter where adventure takes you!

 

• Bills Pipes

• Pro Circuit

• FMF

 

Ready to take your dirt bike's performance up a notch? We've got you covered! Our knowledgeable team of gearheads has put together some expert guidance on exhaust upgrades – from Dirt Bike Exhaust - Does an Upgrade Help?, 2-Stroke Dirt Bike Exhaust: Upgrade Pipe, Silencer or Both? and more. Don't miss the ride with any questions left unanswered – just give us a call at 1-231-767-5055 for personalized advice tailored specifically to get the most out of your dirt bike’s exhaust system.