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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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  • FREE SHIPPING OVER $249
    10 Inch Diameter Performance Shorty Muffler 5 Inch ID / ID X 30 Inch OAL by BESTfit

    10 Inch Diameter Performance Shorty Muffler 5 Inch ID / ID X 30 Inch OAL by BESTfit

    BESTFIT TRUCK PARTS

    $198.99
    BESTfit 30 Inch Performance Shorty MufflerEnhance your truck's performance with the BESTfit 10 X 30 Inch Performance Shorty Muffler, engineered for maximum efficiency and power. This high-quality...
    09-080207
    SKU:
    09-080207
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Length Options:
    30 Inch
    Diameter Options:
    5 Inch
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    $198.99
    Qty in Cart: 0
    Price:
    $198.99
    Subtotal:
  • 6 Inch Diameter Chrome Steel Muffler 5 ID / 6 ID X 51 Inch OAL by BESTfit

    6 Inch Diameter Chrome Steel Muffler 5 ID / 6 ID X 51 Inch OAL by BESTfit

    BESTFIT TRUCK PARTS

    $566.99
    BESTfit Chrome Steel Exhaust Muffler W/ Internal Louvered CoreElevate your truck's exhaust with the BESTfit Chrome Steel Muffler, a masterpiece of engineering and design. This top-of-the-line muffler...
    09-080205
    SKU:
    09-080205
    Diameter Options:
    6 Inch
    Truck Class:
    Universal
    Length Options:
    51 Inch
    Material Options:
    Steel
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    $566.99
    Qty in Cart: 0
    Price:
    $566.99
    Subtotal:
  • BESTfit 6 Inch Round Chrome Muffler 6 ID x 51 Inch OAL

    BESTfit 6 Inch Round Chrome Muffler 6 ID x 51 Inch OAL

    BESTFIT TRUCK PARTS

    $586.99
    BESTfit Chrome Exhaust MufflerUpgrade your truck's exhaust with the luxurious BESTfit 51 Inch Chrome Muffler, designed with a 6 Inch Inlet & Outlet from 4 State Trucks. Made of premium chrome-plated...
    09-080204
    SKU:
    09-080204
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Length Options:
    51 Inch
    Diameter Options:
    6 Inch
    Product Type:
    Exhaust
    $586.99
    Qty in Cart: 0
    Price:
    $586.99
    Subtotal:
  • FREE SHIPPING OVER $249
    9 Inch Diameter Short Galvanized Exhaust Muffler 5 ID / 5 ID X 12 Inch Body Length by BESTfit

    9 Inch Diameter Short Galvanized Exhaust Muffler 5 ID / 5 ID X 12 Inch Body Length by BESTfit

    BESTFIT TRUCK PARTS

    $94.99
    BESTfit 9 x 12 Inch Muffler W/ 5 Inch ID Inlet & OutletTransform your truck's exhaust system with the BESTfit 9 X 12 Inch Short Galvanized Exhaust Muffler, featuring a 5 Inch ID inlet and outlet for...
    09-080201
    SKU:
    09-080201
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Finish Options:
    Galvanized
    Diameter Options:
    9 Inch
    Length Options:
    12 Inch
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    $94.99
    Qty in Cart: 0
    Price:
    $94.99
    Subtotal:
  • BESTfit 6 Inch Diameter Quiet Performance Muffler 4 ID / 5 ID X 29 Inch OAL

    BESTfit 6 Inch Diameter Quiet Performance Muffler 4 ID / 5 ID X 29 Inch OAL

    BESTFIT TRUCK PARTS

    $1,064.99
    BESTfit 6 X 29 Inch Aluminized Steel Quiet Performance Muffler W/ 4 Inch Inlet, 5 Inch OutletElevate your driving experience with the BESTfit 6 X 29 Inch Aluminized Steel Quiet Performance Muffler...
    09-080200013
    SKU:
    09-080200013
    Truck Class:
    Universal
    Diameter Options:
    5 Inch
    Length Options:
    29 Inch
    Material Options:
    Aluminized Steel
    Make:
    Universal Items
    Product Type:
    Exhaust
    $1,064.99
    Qty in Cart: 0
    Price:
    $1,064.99
    Subtotal:
  • BESTfit 6 Inch Diameter Quiet Performance Muffler 4 ID / ID X 29 Inch OAL

    BESTfit 6 Inch Diameter Quiet Performance Muffler 4 ID / ID X 29 Inch OAL

    BESTFIT TRUCK PARTS

    $622.99
    BESTfit 6 X 29 Inch Aluminized Steel Quiet Performance Muffler W/ 4 Inch Inlet/OutletDiscover the ultimate solution for a quieter ride with the BESTfit 6 X 29 Inch Aluminized Steel Quiet Performance...
    09-080200012
    SKU:
    09-080200012
    Diameter Options:
    4 Inch
    Truck Class:
    Universal
    Length Options:
    29 Inch
    Material Options:
    Aluminized Steel
    Make:
    Universal Items
    Product Type:
    Exhaust
    $622.99
    Qty in Cart: 0
    Price:
    $622.99
    Subtotal:
  • BESTfit 8 OD X 45 Inch VK Internal Muffler Pipe

    BESTfit 8 OD X 45 Inch VK Internal Muffler Pipe

    BESTFIT TRUCK PARTS

    $696.99
    BESTfit 8 Inch OD X 45 Inch VK Internal Muffler PipeTransform your vehicle's exhaust system with the BESTfit 8 Inch OD X 45 Inch VK Internal Muffler Pipe, the ultimate solution for drivers seeking...
    09-080200011
    SKU:
    09-080200011
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Length Options:
    45 Inch
    Diameter Options:
    8 Inch
    Product Type:
    Exhaust
    $696.99
    Qty in Cart: 0
    Price:
    $696.99
    Subtotal:
  • BESTfit 7 OD X 45 Inch VK Internal Muffler Pipe

    BESTfit 7 OD X 45 Inch VK Internal Muffler Pipe

    BESTFIT TRUCK PARTS

    $867.99
    BESTfit 7 Inch OD X 45 Inch VK Internal Muffler PipeEnhance your truck's exhaust system with the BESTfit 7 Inch OD X 45 Inch VK Internal Muffler Pipe, a solution designed for superior performance...
    09-080200010
    SKU:
    09-080200010
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Diameter Options:
    7 Inch
    Length Options:
    45 Inch
    Product Type:
    Exhaust
    $867.99
    Qty in Cart: 0
    Price:
    $867.99
    Subtotal:
  • BESTfit 6 OD X 45 Inch VK Internal Muffler Pipe

    BESTfit 6 OD X 45 Inch VK Internal Muffler Pipe

    BESTFIT TRUCK PARTS

    $928.99
    BESTfit 6 Inch OD X 45 Inch VK Internal Muffler PipeIntroducing the BESTfit 6 Inch OD X 45 Inch VK Internal Muffler Pipe, the ultimate upgrade for your truck's exhaust system. Constructed from...
    09-080200009
    SKU:
    09-080200009
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Length Options:
    45 Inch
    Diameter Options:
    6 Inch
    Product Type:
    Exhaust
    $928.99
    Qty in Cart: 0
    Price:
    $928.99
    Subtotal:
  • BESTfit 5 OD X 45 Inch VK Internal Muffler Pipe

    BESTfit 5 OD X 45 Inch VK Internal Muffler Pipe

    BESTFIT TRUCK PARTS

    $775.99
    BESTfit 5 Inch OD X 45 Inch VK Internal Muffler PipeElevate your truck's exhaust system with the BESTfit 5 Inch OD X 45 Inch VK Internal Muffler Pipe, an upgrade designed for superior performance and...
    09-080200008
    SKU:
    09-080200008
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Diameter Options:
    5 Inch
    Length Options:
    45 Inch
    Product Type:
    Exhaust
    $775.99
    Qty in Cart: 0
    Price:
    $775.99
    Subtotal:
  • BESTfit 5 OD X 18 Inch Aluminized Internal Muffler / Baffle -16 Gauge

    BESTfit 5 OD X 18 Inch Aluminized Internal Muffler / Baffle -16 Gauge

    BESTFIT TRUCK PARTS

    $79.99
    BESTfit Type 1 A 16 Gauge Aluminized Steel Internal MufflerThis high-performance internal muffler is designed for 36-inch straight stacks, fitting into the bottom for efficient operation on older...
    09-080200006
    SKU:
    09-080200006
    Diameter Options:
    5 Inch
    Truck Class:
    Universal
    Length Options:
    18 Inch
    Material Options:
    Aluminized Steel
    Make:
    Universal Items
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    $79.99
    Qty in Cart: 0
    Price:
    $79.99
    Subtotal:
  • BESTfit 4 X 18 Inch Aluminized Steel Internal Muffler 16 Gauge

    BESTfit 4 X 18 Inch Aluminized Steel Internal Muffler 16 Gauge

    BESTFIT TRUCK PARTS

    $66.99
    BESTfit Internal Exhaust Baffle TubeExperience the superior quality of the BESTfit 4 X 18 Inch 16 Gauge Aluminized Steel Internal Muffler from 4 State Trucks. This premium internal muffler, made from...
    09-080200005
    SKU:
    09-080200005
    Truck Class:
    Universal
    Diameter Options:
    4 Inch
    Length Options:
    18 Inch
    Material Options:
    Aluminized Steel
    Make:
    Universal Items
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    $66.99
    Qty in Cart: 0
    Price:
    $66.99
    Subtotal:
  • BESTfit 8 Inch Diameter Powerflow Muffler Type 1 4 ID / ID X 21 Inch OAL

    BESTfit 8 Inch Diameter Powerflow Muffler Type 1 4 ID / ID X 21 Inch OAL

    BESTFIT TRUCK PARTS

    $181.99
    BESTfit 4 Inch In/Out X 8 X 21 Inch Aluminized Steel Type 1 MufflerDiscover the superior performance of the BESTfit 4 Inch In/Out X 8 X 21 Inch Aluminized Steel Type 1 Muffler, designed for those who...
    09-080200004
    SKU:
    09-080200004
    Truck Class:
    Universal
    Diameter Options:
    4 Inch
    Length Options:
    21 1/2 Inch
    Material Options:
    Aluminized Steel
    Make:
    Universal Items
    Product Type:
    Exhaust
    $181.99
    Qty in Cart: 0
    Price:
    $181.99
    Subtotal:
  • BESTfit 8 Inch Diameter Muffler Type 1 4 ID / 5 ID X 21 Inch OAL

    BESTfit 8 Inch Diameter Muffler Type 1 4 ID / 5 ID X 21 Inch OAL

    BESTFIT TRUCK PARTS

    $145.99
    BESTfit 4 Inch In X 5 Inch Out X 8 X 21 Inch Aluminized Steel Type 1 MufflerBoost your truck's exhaust performance with the BESTfit 4 Inch In X 5 Inch Out X 8 X 21 Inch Aluminized Steel Type 1...
    09-080200003
    SKU:
    09-080200003
    Diameter Options:
    5 Inch
    Truck Class:
    Universal
    Length Options:
    21 Inch
    Material Options:
    Aluminized Steel
    Make:
    Universal Items
    Style Options:
    Angled
    Product Type:
    Exhaust
    $145.99
    Qty in Cart: 0
    Price:
    $145.99
    Subtotal:
  • 10 Inch Diameter Performance Muffler 6 ID / 6 ID X 51.5 Inch OAL

    10 Inch Diameter Performance Muffler 6 ID / 6 ID X 51.5 Inch OAL

    PITTSBURGH POWER

    $305.99
    High Performance Muffler Increases Horsepower, Mileage & Reduces Back PressureThe Performance Muffler, measuring 10 inches by 51.5 inches and featuring a 6-inch inlet and outlet, is designed to...
    09-080200001
    SKU:
    09-080200001
    Diameter Options:
    6 Inch
    Truck Class:
    Universal
    Location:
    Made In USA
    Material Options:
    Steel
    Make:
    Universal Items
    Length Options:
    51 1/2 Inch
    Product Type:
    Exhaust
    $305.99
    Qty in Cart: 0
    Price:
    $305.99
    Subtotal:
  • BESTfit 10 Inch Diameter High Flow Muffler Type 1 51 Inch OAL

    BESTfit 10 Inch Diameter High Flow Muffler Type 1 51 Inch OAL

    BESTFIT TRUCK PARTS

    $534.99
    10 Inch Diameter Replacement MufflerThis high flow replacement muffler works with all engines and is designed to replace 10-inch diameter stock mufflers. It runs as quietly as your stock muffler...
    09-080200
    SKU:
    09-080200
    Truck Class:
    Universal
    Diameter Options:
    5 Inch
    Make:
    Universal Items
    Product Type:
    Exhaust
    Length Options:
    44 1/2 Inch
    Material Options:
    Aluminized Steel
    Ready To Ship:
    Yes
    $534.99
    Qty in Cart: 0
    Price:
    $534.99
    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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