Our Peterbilt 330/335/337 DPF & Mufflers product line offers a wide selection of high-quality replacement mufflers, diesel particulate filters (DPFs), and related components for these popular Peterbilt truck models. If your muffler or DPF is worn out, it's worth your while to replace it soon. A functional DPF on your truck can help ensure particulate matter and soot from exhaust gasses is captured and burned off to minimize harmful emissions. The biggest features of these products include improved airflow, reduced backpressure, and enhanced engine performance. You can shop for various materials to suite your style preferences, be it durable aluminized or stainless steel for long-lasting durability.