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Mufflers

Your semi truck muffler is responsible for reducing noise, controlling exhaust backpressure. If your truck is getting noisier, it might be time to for a replacement. Shop durable aftermarket mufflers that offer direct-fit compatibility with your big truck exhaust.
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  • Price
  • Subtotal
  • BESTfit 10 X 15 X 16 Inch Aluminized Steel Type 4 Muffler For Mack

    BESTfit 10 X 15 X 16 Inch Aluminized Steel Type 4 Muffler For Mack

    BESTFIT TRUCK PARTS

    $215.26
    10 X 15 X 16 Inch Muffler W/ 4 Inch Inlet & 3.8 Inch OD By BESTfitKeep your Mack truck's exhaust running efficiently with the BESTfit 10 x 15 x 16 Inch Type 4 Muffler. Constructed from aluminized...
    GR-M-149
    SKU:
    GR-M-149
    Product Type:
    Exhaust
    $215.26
    Qty in Cart: 0
    Price:
    $215.26
    Subtotal:
  • FREE SHIPPING
    BESTfit 11 Inch Diameter Muffler With 3 ID / 4 ID X 41.75 Inch OAL

    BESTfit 11 Inch Diameter Muffler With 3 ID / 4 ID X 41.75 Inch OAL

    BESTFIT TRUCK PARTS

    $267.99
    11 Inch Diameter Aluminized Steel Muffler With 3 ID / 4 ID X 41.75 Inch OAL By BESTfitKeep your truck running efficiently with the BESTfit 11 Inch Diameter Muffler. Made of aluminized steel, this...
    29-080211
    SKU:
    29-080211
    Length Options:
    30 Inch
    Diameter Options:
    11 Inch
    Material Options:
    Aluminized Steel
    Product Type:
    Exhaust
    Make:
    Universal Items
    $267.99
    Qty in Cart: 0
    Price:
    $267.99
    Subtotal:
  • BESTfit 10 Inch Diameter Aluminized Type 1 Diesel Muffler With 5 To 6 Inch ID

    BESTfit 10 Inch Diameter Aluminized Type 1 Diesel Muffler With 5 To 6 Inch ID

    BESTFIT TRUCK PARTS

    $274.99
    Universal Stainless Steel 5 Inch ID End In - 6 Inch End Out MufflerThe Type 1 diesel full-sized muffler measures 10 inches in diameter and 44.5 inches long. With its 5-inch intake and 6-inch output,...
    09-08020026
    SKU:
    09-08020026
    Product Type:
    Exhaust
    Material Options:
    Aluminized Steel
    Make:
    Universal Items
    Diameter Options:
    6 Inch
    $274.99
    Qty in Cart: 0
    Price:
    $274.99
    Subtotal:
  • BESTfit 9 Inch Diameter Aluminized Type 1 Muffler With 4 Inch ID / ID

    BESTfit 9 Inch Diameter Aluminized Type 1 Muffler With 4 Inch ID / ID

    BESTFIT TRUCK PARTS

    $206.99
    Stainless Steel 4 Inch ID End In - End Out Centered Muffler* High Quality Muffler* Aluminized* Dimensions:  - 9 Inch Body Diameter   - 44.5 Inch Body Length   - 51 Inch Overall Length* Made In USA*...
    09-08020051
    SKU:
    09-08020051
    Product Type:
    Exhaust
    Length Options:
    51 Inch
    Material Options:
    Aluminized Steel
    Diameter Options:
    9 Inch
    Make:
    Universal Items
    $206.99
    Qty in Cart: 0
    Price:
    $206.99
    Subtotal:
  • BESTfit 9 Inch Diameter Type 1 Muffler With 5 Inch ID / ID

    BESTfit 9 Inch Diameter Type 1 Muffler With 5 Inch ID / ID

    BESTFIT TRUCK PARTS

    $184.99
    Universal Economy Standard Style Muffler* High Quality Muffler* Dimensions:  - 5 Inch Id/ID  - 9 Inch Body Diameter   - 44.5 Inch Body Length   - 51 Inch Overall Length* Made In USA* Sold...
    09-08020052
    SKU:
    09-08020052
    Product Type:
    Exhaust
    Diameter Options:
    5 Inch
    Length Options:
    51 Inch
    Make:
    Universal Items
    $184.99
    Qty in Cart: 0
    Price:
    $184.99
    Subtotal:
  • 9 Inch Diameter Muffler 5 Inch ID / OD X 52 Inch OAL

    9 Inch Diameter Muffler 5 Inch ID / OD X 52 Inch OAL

    AFTERMARKET

    $270.99
    9 Inch Diameter Stack Muffler With 5 Inch Inlet And Outlet With Interior BaffleExperience quieter, more efficient exhaust with the 9 Inch Diameter Muffler, crafted for heavy-duty trucks that demand...
    29-08020002
    SKU:
    29-08020002
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Length Options:
    52 Inch
    Make:
    Universal Items
    Product Type:
    Exhaust
    $270.99
    Qty in Cart: 0
    Price:
    $270.99
    Subtotal:
  • 10 Inch Diameter Stack Muffler 5 ID / OD X 51.5 Inch OAL

    10 Inch Diameter Stack Muffler 5 ID / OD X 51.5 Inch OAL

    AFTERMARKET

    $155.99
    10 Inch Diameter Stack Muffler With 5 Inch Inlet And OutletOptimize your truck's exhaust system with the 10 Inch Diameter Stack Muffler, a high-quality, aluminized steel muffler built for longevity...
    29-08020001
    SKU:
    29-08020001
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Kenworth
    Make:
    Peterbilt
    Make:
    Mack
    Make:
    Volvo
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    $155.99
    Qty in Cart: 0
    Price:
    $155.99
    Subtotal:
  • Galvanized Steel Exhaust Resonator 4 Inch Inlet / Outlet 9 Inch Body

    Galvanized Steel Exhaust Resonator 4 Inch Inlet / Outlet 9 Inch Body

    AFTERMARKET

    $210.99
    Galvanized Steel Exhaust Resonator With Interior Baffle DesignImprove your heavy-duty truck's exhaust system with the Galvanized Steel Exhaust Resonator. Its 4-inch inlet and outlet, 9-inch body...
    09-08020002
    SKU:
    09-08020002
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Length Options:
    16 Inch
    Diameter Options:
    4 Inch
    Make:
    Universal Items
    Product Type:
    Exhaust
    $210.99
    Qty in Cart: 0
    Price:
    $210.99
    Subtotal:
  • Mufflers With Interior Baffles 4 Inch Inlet / Outlet

    Mufflers With Interior Baffles 4 Inch Inlet / Outlet

    AFTERMARKET

    $271.99 - $389.99
    Maximize your truck's exhaust performance with these durable Mufflers with Interior Baffles featuring 4-inch inlet and outlet. With options including 9 Inch Diameter x 51 Inch OAL, 10 Inch Diameter x...
    PPR_298971
    SKU:
    PPR_298971
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Exhaust
    $271.99 - $389.99
    Qty in Cart: 0
    Price:
    $271.99 - $389.99
    Subtotal:
  • RigMaster Large Muffler For Caterpillar, Perkins Engines

    RigMaster Large Muffler For Caterpillar, Perkins Engines

    RIGMASTER

    $138.99
    RigMaster Muffler For Large Model - LG6-001* High Quality Muffler * Sold Individually * Warranty On Mufflers Against Defects In Workmanship & Material From Date Of Purchase*** High Quality...
    LG6001
    SKU:
    LG6001
    Truck Class:
    Heavy Duty
    Material Options:
    Rubber
    Make:
    Universal Items
    Product Type:
    Exhaust
    $138.99
    Qty in Cart: 0
    Price:
    $138.99
    Subtotal:
  • 9 Inch Diameter Galvanized Resonator Muffler Type 1 4 ID / ID X 16.5 Inch OAL

    9 Inch Diameter Galvanized Resonator Muffler Type 1 4 ID / ID X 16.5 Inch OAL

    BESTFIT TRUCK PARTS

    $124.99
    16.5 Inch Galvanized Resonator Muffler, 9 Inch Body DiameterUpgrade your exhaust system with this high-quality 16.5 Inch Galvanized Type 1 Resonator Muffler, featuring a 4 Inch ID inlet and outlet...
    09-080231
    SKU:
    09-080231
    Finish Options:
    Galvanized
    Diameter Options:
    4 Inch
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Exhaust
    $124.99
    Qty in Cart: 0
    Price:
    $124.99
    Subtotal:
  • FREE SHIPPING OVER $249
    9 Inch Diameter Muffler 5 ID / 5 ID X 26.50 Inch OAL 87Q-500-674

    9 Inch Diameter Muffler 5 ID / 5 ID X 26.50 Inch OAL 87Q-500-674

    AUTOMANN USA

    $183.99
    5 X 26.5 Inch Galvanized Steel Exhaust Muffler With Interior Baffles And No Divider, Straight Through Design.Optimize your truck's exhaust with the Galvanized 26.5 Inch Exhaust Muffler, featuring a...
    09-080206
    SKU:
    09-080206
    Diameter Options:
    9 Inch
    Finish Options:
    Galvanized
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Exhaust
    Length Options:
    27 Inch
    Ready To Ship:
    Yes
    $183.99
    Qty in Cart: 0
    Price:
    $183.99
    Subtotal:
  • On Sale
    FREE SHIPPING OVER $249
    BESTfit Internal Muffler Inserts For 5in, 6in, 7in & 8in Stacks

    BESTfit Internal Muffler Inserts For 5in, 6in, 7in & 8in Stacks

    BESTFIT TRUCK PARTS

    $144.49 - $193.99
    Reduce exhaust noise and extend stack life with BESTfit Internal Muffler Inserts for 5-, 6-, 7-, and 8-inch stacks. Crafted for optimal airflow and precision fit, these inserts replace OEM parts...
    PPR_894
    SKU:
    PPR_894
    Truck Class:
    Universal
    Length Options:
    39 Inch
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Product Type:
    Exhaust
    Diameter Options:
    7 Inch
    Diameter Options:
    6 Inch
    Material Options:
    Aluminized Steel
    Diameter Options:
    5 Inch
    Ready To Ship:
    Yes
    $144.49 - $193.99
    Qty in Cart: 0
    Price:
    $144.49 - $193.99
    Subtotal:
  • BESTfit 9 Inch Diameter Muffler With 5 ID / 5 ID X 51 Inch OAL

    BESTfit 9 Inch Diameter Muffler With 5 ID / 5 ID X 51 Inch OAL

    BESTFIT TRUCK PARTS

    $165.99
    BESTfit 9 Inch Diameter Muffler With 5 Inch Inlet & OutletUpgrade your truck's exhaust system with the BESTfit 9 Inch Diameter Muffler from 4 State Trucks. This high-quality muffler is designed to...
    29-080201
    SKU:
    29-080201
    Truck Class:
    Heavy Duty
    Diameter Options:
    9 Inch
    Length Options:
    51 Inch
    Material Options:
    Steel
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    $165.99
    Qty in Cart: 0
    Price:
    $165.99
    Subtotal:
  • BESTfit 10 Inch Diameter Exhaust Muffler OE Style 5 ID / ID X 51 Inch OAL

    BESTfit 10 Inch Diameter Exhaust Muffler OE Style 5 ID / ID X 51 Inch OAL

    BESTFIT TRUCK PARTS

    $167.99
    BESTfitHeavy Gauge Steel W/ Aluminized Plating OE Style Exhaust MufflerThe BESTfit 5 X 51 Inch Aluminized Steel Exhaust Muffler offers an OE-style upgrade for your truck's exhaust system. This...
    29-08020000
    SKU:
    29-08020000
    Diameter Options:
    5 Inch
    Truck Class:
    Heavy Duty
    Length Options:
    51 Inch
    Material Options:
    Aluminized Steel
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Exhaust
    Make:
    International
    Make:
    Freightliner
    Make:
    Western Star
    Make:
    Volvo
    Make:
    Mack
    $167.99
    Qty in Cart: 0
    Price:
    $167.99
    Subtotal:
  • 10 Inch Diameter Muffler 5 ID X 51 Inch OAL- Replaces 04-21774-001 by BESTfit

    10 Inch Diameter Muffler 5 ID X 51 Inch OAL- Replaces 04-21774-001 by BESTfit

    BESTFIT TRUCK PARTS

    $117.99
    BESTfit 10 Inch Diameter Muffler With 5 Inch Inlet & OutletOptimize your exhaust system with the BESTfit 10 Inch Diameter Muffler, featuring a 5-inch inlet and outlet for maximum efficiency. With a...
    29-080200
    SKU:
    29-080200
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Diameter Options:
    5 Inch
    Length Options:
    51 Inch
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    $117.99
    Qty in Cart: 0
    Price:
    $117.99
    Subtotal:
  • FREE SHIPPING OVER $249
    8 Inch Diameter Muffler 5 ID / ID X 30 Inch OAL by BESTfit

    8 Inch Diameter Muffler 5 ID / ID X 30 Inch OAL by BESTfit

    BESTFIT TRUCK PARTS

    $161.99
    BESTfit Muffler 8 Inch DiameterThe BESTfit 8 X 30 Inch OAL Exhaust Muffler is an exceptional choice for drivers looking to enhance their truck's exhaust with added performance and durability. Made...
    09-080230
    SKU:
    09-080230
    Diameter Options:
    8 Inch
    Truck Class:
    Universal
    Material Options:
    Aluminized Steel
    Make:
    Universal Items
    Length Options:
    30 Inch
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    $161.99
    Qty in Cart: 0
    Price:
    $161.99
    Subtotal:
  • FREE SHIPPING OVER $249
    BESTfit Alumnzd Steel Muffler 8 Inch Diameter W/ 5 Inch ID Inlet/Outlet

    BESTfit Alumnzd Steel Muffler 8 Inch Diameter W/ 5 Inch ID Inlet/Outlet

    BESTFIT TRUCK PARTS

    $143.99
    Muffler 8 Inch Diameter Alumnzd Steel W/ 5 Inch ID Inlet/OutletThe BESTfit 8 X 22 Inch Aluminized Steel Muffler offers an exceptional blend of durability and performance for your truck's exhaust...
    09-080229
    SKU:
    09-080229
    Diameter Options:
    8 Inch
    Truck Class:
    Universal
    Material Options:
    Aluminized Steel
    Make:
    Universal Items
    Length Options:
    22 Inch
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    $143.99
    Qty in Cart: 0
    Price:
    $143.99
    Subtotal:
  • 10 Inch Diameter Performance Sport Muffler 5 ID / ID X 51.5 Inch

    10 Inch Diameter Performance Sport Muffler 5 ID / ID X 51.5 Inch

    PITTSBURGH POWER

    $275.99
    Pittsburgh Power Performance Sport MufflerElevate your truck's performance with the Pittsburgh Power Performance Sport Muffler, designed to enhance power and efficiency. With its substantial size and...
    09-080220
    SKU:
    09-080220
    Truck Class:
    Universal
    Diameter Options:
    10 Inch
    Location:
    Made In USA
    Material Options:
    Steel
    Make:
    Universal Items
    Length Options:
    51 1/2 Inch
    Product Type:
    Exhaust
    $275.99
    Qty in Cart: 0
    Price:
    $275.99
    Subtotal:
  • 10 Inch Diameter Performance Muffler 51.5 Inch OAL by BESTfit

    10 Inch Diameter Performance Muffler 51.5 Inch OAL by BESTfit

    BESTFIT TRUCK PARTS

    $199.99
    BESTfit 51.5 Inch Performance Sport MufflerExperience enhanced performance and power with the BESTfit 51.5 Inch Performance Sport Muffler, meticulously designed to meet the demands of...
    09-080208
    SKU:
    09-080208
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Length Options:
    51 Inch
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    $199.99
    Qty in Cart: 0
    Price:
    $199.99
    Subtotal:
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Adding your products to cart

Shop Aftermarket Semi Truck Mufflers Designed for Class 8 Trucks

Semi-truck mufflers greatly reduce exhaust noise and improve fuel efficiency. They’re also required by law. If your muffler is busted, you can expect: loud exhaust noise, poor fuel efficiency, leaks, strong diesel gases oozing into the cab, and visible muffler damage. We’ve got you covered. Browse through our wide selection of aftermarket commercial truck mufflers anywhere, at any time on our mobile app. Enjoy fast shipping, competitive prices, and customer support from parts experts who know Class 8 truck exhaust systems inside and out. Our products allow you to stay DOT-compliant for noise reduction and fit perfectly to your truck make/model. If you need to replace your existing OEM-style muffler, we carry reputable aftermarket brands that deliver the same quality of real-world performance. Brands like Pittsburgh Power, BESTfit, Automann, and Rigmaster deliver a ton of long-term value and come with workmanship warranties for added peace of mind. Find critical replacement components like:
  • Exhaust Resonators: their chambered, perforated design works directly with the muffler to help control high-frequency sounds and to help manage exhaust flow which improves fuel consumption and helps the engine produce more power.
  • Internal Exhaust: slides directly into the exhaust stack to suppress noise without generating excessive exhaust fume backpressure that can hurt the engine.

Find the Right Size Muffler for Your Truck

Mufflers are made to fit the exhaust stack diameter, not the make/model of the truck. To find the right fit, measure your exhaust pipe. Before choosing a muffler type, consider the sound profile you want. This can change based on the type of material (galvanized aluminum or stainless steel) and the design. For a tight install: shop 5-inch, 6-inch, and compact muffler designs. For a high exhaust flow:buy a straight-through performance muffler. For a Quieter ride: get a Donaldson Type 1 aluminized or stainless steel 10-inch muffler to silence engine brake “bark" between 19dBA (low range) and 23dBA (high range).

Why Upgrade Your Semi Truck Muffler?

If you want to experience: - improved horsepower and torque - better exhaust flow and lower engine stress - reduced backpressure - lower exhaust noise Need to upgrade all your semi-truck exhaust parts? Throw in a set of semi exhaust clamps to secure your muffler to the pipes. Get some protection from high-temperature exhaust fumes by adding a exhaust stack heat shield. Pair your muffler with a brand-new set of chrome-polished semi truck stacks. 4 State Trucks has everything you need to start enhancing the performance of your commercial big rig inside and out.

Frequently Asked Questions About Mufflers

How do I know which muffler size and shape will fit my truck?

Muffler fitment depends on inlet and outlet diameter, overall body length and width, and the mounting configuration your exhaust system uses. Before ordering, measure your current muffler's inlet/outlet size and overall dimensions, or check your exhaust system's specifications. If you're unsure, our team can help you cross-reference measurements to find a compatible replacement.

What's the difference between straight-through and baffled (chambered) mufflers?

Straight-through mufflers use a perforated core wrapped in sound-absorbing material, which generally allows for better exhaust flow and a deeper, louder tone. Baffled mufflers use internal chambers to redirect sound waves, typically resulting in a quieter, more traditional truck sound. Your choice comes down to the sound level and performance characteristics you prefer.

Will a new muffler affect my truck's performance or fuel economy?

A muffler that restricts exhaust flow less than your old one may allow your engine to breathe slightly easier, but a properly sized OEM-style replacement is unlikely to produce noticeable performance gains on its own. Choosing a muffler with the correct diameter for your exhaust system matters more than brand or style when it comes to maintaining performance.

What material and finish options are available, and how long will they last?

Mufflers are commonly available in aluminized steel and stainless steel. Aluminized steel offers good heat and corrosion resistance at a lower cost, while stainless steel provides better long-term durability and resistance to rust, especially in areas with road salt or heavy moisture exposure. Stainless steel typically costs more upfront but can outlast aluminized options over time.

Can I install a muffler myself, or do I need a professional?

Many drivers replace a muffler themselves if it bolts or clamps into the existing exhaust system in the same location as the original. You'll want basic tools, safety equipment, and the truck safely lifted and supported. If your muffler requires welding, cutting, or modification to fit, or if you're not comfortable working under the vehicle, it's best to have a qualified shop handle the installation.


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