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4 State Trucks carries a variety of aftermarket mufflers for your Kenworth W990. We carry exhaust resonators, performance shorty mufflers, high flow replacement mufflers and muffler inserts.

Kenworth W990 DPF & Mufflers

Upgrade your Kenworth W990 with premium DPF & Muffler parts from BESTfit. This product lineup includes a wide selection of high-flow mufflers, resonators, and DPF replacements engineered to provide improved performance and reduced emissions for your Kenworth W990 semi-truck. Featuring aluminized steel and stainless steel construction for exceptional durability, these parts help maximize horsepower and fuel efficiency while delivering a smooth, quiet ride. Whether you need a direct replacement DPF, a performance-boosting muffler, or customizable exhaust components, you'll find the perfect fit for your W990 in this comprehensive product lineup. Enhance your Kenworth's power, sound, and style with BESTfit DPF & Muffler upgrades.

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