Peterbilt 389 DPF & Mufflers
Limit the noise coming from your truck with Peterbilt 389 aftermarket noise reduction mufflers and more. We have different styles and sizes of custom, chrome, and aftermarket mufflers to ensure you find the perfect one for your big rig. Shop at 4 State Trucks for top-notch mufflers.
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On SaleFREE SHIPPING OVER $249Limited Quantity Available
BESTfit Internal Muffler Inserts For 5in, 6in, 7in & 8in Stacks
BESTFIT TRUCK PARTS
$144.49 - $193.99Reduce 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 - $193.99Qty in Cart: 0Price:$144.49 - $193.99Subtotal: -
FREE SHIPPING OVER $249
9 Inch Diameter Short Galvanized Exhaust Muffler 5 ID / 5 ID X 12 Inch Body Length by BESTfit
BESTFIT TRUCK PARTS
$94.99BESTfit 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
$94.99Qty in Cart: 0Price:$94.99Subtotal: -
10 Inch Diameter Muffler 5 ID X 51 Inch OAL- Replaces 04-21774-001 by BESTfit
BESTFIT TRUCK PARTS
$117.99BESTfit 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
$117.99Qty in Cart: 0Price:$117.99Subtotal: -
FREE SHIPPING OVER $249
10 Inch Diameter Performance Shorty Muffler 5 Inch ID / ID X 30 Inch OAL by BESTfit
BESTFIT TRUCK PARTS
$198.99BESTfit 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
$198.99Qty in Cart: 0Price:$198.99Subtotal: -
BESTfit 9 Inch Diameter Muffler With 5 ID / 5 ID X 51 Inch OAL
BESTFIT TRUCK PARTS
$165.99BESTfit 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
$165.99Qty in Cart: 0Price:$165.99Subtotal: -
FREE SHIPPING OVER $249
8 Inch Diameter Muffler 5 ID / ID X 30 Inch OAL by BESTfit
BESTFIT TRUCK PARTS
$161.99BESTfit 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
$161.99Qty in Cart: 0Price:$161.99Subtotal: -
10 Inch Diameter Performance Sport Muffler 5 ID / ID X 51.5 Inch
PITTSBURGH POWER
$275.99Pittsburgh 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
- Ready To Ship:
- Yes
$275.99Qty in Cart: 0Price:$275.99Subtotal: -
6 Inch Diameter Chrome Steel Muffler 5 ID / 6 ID X 51 Inch OAL by BESTfit
BESTFIT TRUCK PARTS
$566.99BESTfit 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
$566.99Qty in Cart: 0Price:$566.99Subtotal: -
FREE SHIPPING OVER $249
BESTfit Alumnzd Steel Muffler 8 Inch Diameter W/ 5 Inch ID Inlet/Outlet
BESTFIT TRUCK PARTS
$143.99Muffler 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
$143.99Qty in Cart: 0Price:$143.99Subtotal: -
10 Inch Diameter Performance Muffler 6 ID / 6 ID X 51.5 Inch OAL
PITTSBURGH POWER
$305.99High 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
$305.99Qty in Cart: 0Price:$305.99Subtotal: -
BESTfit 5 OD X 18 Inch Aluminized Internal Muffler / Baffle -16 Gauge
BESTFIT TRUCK PARTS
$79.99BESTfit 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
$79.99Qty in Cart: 0Price:$79.99Subtotal: -
FREE SHIPPING OVER $249
9 Inch Diameter Muffler 5 ID / 5 ID X 26.50 Inch OAL 87Q-500-674
AUTOMANN USA
$183.995 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
$183.99Qty in Cart: 0Price:$183.99Subtotal: -
BESTfit 10 Inch Diameter High Flow Muffler Type 1 51 Inch OAL
BESTFIT TRUCK PARTS
$534.9910 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
$534.99Qty in Cart: 0Price:$534.99Subtotal: -
10 Inch Diameter Performance Muffler 51.5 Inch OAL by BESTfit
BESTFIT TRUCK PARTS
$199.99BESTfit 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
$199.99Qty in Cart: 0Price:$199.99Subtotal: -
BESTfit 6 Inch Round Chrome Muffler 6 ID x 51 Inch OAL
BESTFIT TRUCK PARTS
$586.99BESTfit 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
$586.99Qty in Cart: 0Price:$586.99Subtotal: -
BESTfit 4 X 18 Inch Aluminized Steel Internal Muffler 16 Gauge
BESTFIT TRUCK PARTS
$66.99BESTfit 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
$66.99Qty in Cart: 0Price:$66.99Subtotal: -
10 Inch Diameter Stack Muffler 5 ID / OD X 51.5 Inch OAL
AFTERMARKET
$155.9910 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
$155.99Qty in Cart: 0Price:$155.99Subtotal: -
Mufflers With Interior Baffles 4 Inch Inlet / Outlet
AFTERMARKET
$271.99 - $389.99Maximize 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 - $389.99Qty in Cart: 0Price:$271.99 - $389.99Subtotal: -
Galvanized Steel Exhaust Resonator 4 Inch Inlet / Outlet 9 Inch Body
AFTERMARKET
$210.99Galvanized 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
$210.99Qty in Cart: 0Price:$210.99Subtotal: -
BESTfit 9 Inch Diameter Aluminized Type 1 Muffler With 4 Inch ID / ID
BESTFIT TRUCK PARTS
$206.99Stainless 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
$206.99Qty in Cart: 0Price:$206.99Subtotal: -
BESTfit 8 Inch Diameter Muffler Type 1 4 ID / 5 ID X 21 Inch OAL
BESTFIT TRUCK PARTS
$145.99BESTfit 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
$145.99Qty in Cart: 0Price:$145.99Subtotal: -
BESTfit 8 Inch Diameter Powerflow Muffler Type 1 4 ID / ID X 21 Inch OAL
BESTFIT TRUCK PARTS
$181.99BESTfit 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
$181.99Qty in Cart: 0Price:$181.99Subtotal: -
9 Inch Diameter Galvanized Resonator Muffler Type 1 4 ID / ID X 16.5 Inch OAL
BESTFIT TRUCK PARTS
$124.9916.5 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
$124.99Qty in Cart: 0Price:$124.99Subtotal: -
BESTfit 10 Inch Diameter Aluminized Type 1 Diesel Muffler With 5 To 6 Inch ID
BESTFIT TRUCK PARTS
$274.99Universal 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
$274.99Qty in Cart: 0Price:$274.99Subtotal: -
9 Inch Diameter Muffler 5 Inch ID / OD X 52 Inch OAL
AFTERMARKET
$270.999 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
$270.99Qty in Cart: 0Price:$270.99Subtotal: -
BESTfit 9 Inch Diameter Type 1 Muffler With 5 Inch ID / ID
BESTFIT TRUCK PARTS
$184.99Universal 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
$184.99Qty in Cart: 0Price:$184.99Subtotal: -
FREE SHIPPING
BESTfit 11 Inch Diameter Muffler With 3 ID / 4 ID X 41.75 Inch OAL
BESTFIT TRUCK PARTS
$267.9911 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
$267.99Qty in Cart: 0Price:$267.99Subtotal: -
BESTfit 8 OD X 45 Inch VK Internal Muffler Pipe
BESTFIT TRUCK PARTS
$696.99BESTfit 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
$696.99Qty in Cart: 0Price:$696.99Subtotal: -
BESTfit 5 OD X 45 Inch VK Internal Muffler Pipe
BESTFIT TRUCK PARTS
$775.99BESTfit 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
$775.99Qty in Cart: 0Price:$775.99Subtotal: -
BESTfit 7 OD X 45 Inch VK Internal Muffler Pipe
BESTFIT TRUCK PARTS
$867.99BESTfit 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
$867.99Qty in Cart: 0Price:$867.99Subtotal: -
RigMaster Large Muffler For Caterpillar, Perkins Engines
RIGMASTER
$138.99RigMaster 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
$138.99Qty in Cart: 0Price:$138.99Subtotal: -
BESTfit 6 OD X 45 Inch VK Internal Muffler Pipe
BESTFIT TRUCK PARTS
$928.99BESTfit 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
$928.99Qty in Cart: 0Price:$928.99Subtotal: -
BESTfit 6 Inch Diameter Quiet Performance Muffler 4 ID / 5 ID X 29 Inch OAL
BESTFIT TRUCK PARTS
$1,064.99BESTfit 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
$1,064.99Qty in Cart: 0Price:$1,064.99Subtotal: -
BESTfit 6 Inch Diameter Quiet Performance Muffler 4 ID / ID X 29 Inch OAL
BESTFIT TRUCK PARTS
$622.99BESTfit 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
$622.99Qty in Cart: 0Price:$622.99Subtotal:
