Peterbilt 357/378 DPF & Mufflers
Time to replace or upgrade your muffler? Shop 4 State Trucks' collection of Peterbilt 378 aftermarket mufflers. We have custom, chrome, and aftermarket mufflers. Find the perfect muffler that fits your style and budget at 4 State Trucks.
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BESTfit Muffler Insert For 6 Inch Stacks
BESTFIT TRUCK PARTS
$165.99BESTfit 6 Inch Stack Muffler InsertLet Elite Truck Accessorieshelp you reduce the high pitch, harsh tones that can be found in a diesel exhaust with this quality Exhaust Muffler Insert. Fit snugly into the base of a 6 inch O.D. stack, it can reduce...$165.99 -
BESTfit Muffler Insert For 5 Inch Stacks
BESTFIT TRUCK PARTS
$159.99BESTfit 5 Inch Stack Muffler InsertLet Elite Truck Accessorieshelp you reduce the high pitch, harsh tones that can be found in a diesel exhaust with this quality Exhaust Muffler Insert. Fit snugly into the base of a 5 inch O.D. stack, it can reduce...$159.99 -
Exhaust Heat Shield Mounting Clamp Replaces 14-14695 For Peterbilt 377, 378, 379 & 386
AUTOMANN USA
$46.22Mount Clamp For Exhaust Shield Fits Peterbilt 377, 378, 379 & 386 * High Quality Mounting Clamp* Position - Driver Or Passenger Side – Center Or Upper* Fits 10 Inch Diameter Muffler * Clamp For Mounting Exhaust Heat Shield To Muffler* Sold Individually**...$46.22 -
BESTfit 10 X 30 Inch Performance Shorty Muffler
BESTFIT TRUCK PARTS
$169.29BESTfit 30 Inch Performance Shorty Muffler * High Quality Muffler* Dimensions - 30 Inch Length - 10 Inch Width - 5 Inch I.D.* Designed For Tight Spaces* Muffler Uses Acoustic Louver Sound Dampening* Up To 50 Additional Horsepower And Improved...$169.29 -
Exhaust Heat Shield Mounting Clamp Replaces 14-14668R For Peterbilt 357/378 Passenger Side Lower
AUTOMANN USA
$88.00Muffler Heat Shield Passenger Side Lower Mounting Clamp Fits Peterbilt 357/378 With High Mount Exhaust * High Quality Mounting Clamp* Position-Passenger Side Lower* Fits 10 Inch Diameter Muffler * Lower Left Side Clamp For Mounting Exhaust Heat Shield To...$88.00 -
BESTfit Muffler Insert For 7 Inch Stacks
BESTFIT TRUCK PARTS
$162.99BESTfit 7 Inch Stack Muffler Insert Let Elite Truck Accessorieshelp you reduce the high pitch, harsh tones that can be found in a diesel exhaust with this quality Exhaust Muffler Insert. Fit snugly into the base of a 7 inch O.D. stack, it can reduce...$162.99 -
BESTfit 4 Inch In/Out X 8 X 21 Inch Aluminized Steel Type 1 Muffler
BESTFIT TRUCK PARTS
$159.99BESTfit 4 Inch In/Out X 8 X 21 Inch Aluminized Steel Type 1 Muffler * High Quality Muffler* Aluminized Steel* Dimensions - 4 Inch Inside Diameter - 4 Inch Inside Diameter - 11 Inch Body Diameter - 15 Inch Body Length - 21.5 Inch Over All Length*...$159.99 -
BESTfit Muffler Insert For 8 Inch Stacks
BESTFIT TRUCK PARTS
$182.99BESTfit 8 Inch Stack Muffler InsertLet Elite Truck Accessorieshelp you reduce the high pitch, harsh tones that can be found in a diesel exhaust with this quality Exhaust Muffler Insert. Fit snugly into the base of an 8 inch O.D. stack, it can reduce...$182.99 -
Exhaust Heat Shield Mounting Clamp Replaces 14-14668L For Peterbilt 357/378 Driver Side Lower
AUTOMANN USA
$88.00Muffler Heat Shield Driver Side Lower Mounting Clamp Fits Peterbilt 357/378 With High Mount Exhaust * High Quality Mounting Clamp* Position-Driver Side Lower* Fits 10 Inch Diameter Muffler * Lower Left Side Clamp For Mounting Exhaust Heat Shield To...$88.00 -
Exhaust Heat Shield Mounting Clamp Replaces 14-14664 For Peterbilt 357/378 Upper
AUTOMANN USA
$42.30Muffler Heat Shield Upper Mounting Clamp Fits Peterbilt 357/378 With High Mount Exhaust * High Quality Mounting Clamp* Position-Driver Or Passenger Side Upper* Fits 10 Inch Diameter Muffler * Upper Clamp For Mounting Exhaust Heat Shield To Muffler* For...$42.30 -
BESTfit 5 X 51 Inch Aluminized Steel Exhaust Muffler
BESTFIT TRUCK PARTS
$148.99BESTfitHeavy Gauge Steel W/ Aluminized Plating OE Style Exhaust Muffler * High Quality Exhaust Muffler* Made Of Steel With Aluminized Plating* Dimensions - Inner Diameter: 5 Inch - Outlet Diameter: 5 Inch - Muffler Body Diameter: 10 Inch - Muffler...$148.99 -
Galvanized Steel Exhaust Resonator 5 Inch Inlet With 9 Inch Body
AUTOMANN USA
$131.999 Inch Diameter Exhaust Resonator With 5 Inch ID Inlet and OutletInstall the resonator to the exhaust system of your truck before the muffler to help reduce the noise of the engine. * High Quality Exhaust Resonator* Made Of Galvanized Steel* 5 Inch ID...$131.99