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.