Semi-Truck Mufflers for Heavy Duty Class 8 Trucks

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.