Peterbilt 367 DPF & Mufflers

Frequently Asked Questions About Peterbilt 367 DPF & Mufflers

Will this DPF or muffler fit my Peterbilt 367 without modification?

Fitment depends on your truck's engine make and model, chassis configuration, and the specific emissions system installed at the factory. Peterbilt 367 trucks were built with different engine options over the years, so it's important to check the part number, engine model, and mounting dimensions against your truck's specs before ordering. If you're unsure, our sales team can help confirm compatibility using your VIN or engine serial number.

Are these DPF units and mufflers EPA/DOT compliant?

Most diesel particulate filters and exhaust components sold for on-road use are designed to meet applicable EPA and DOT emissions standards. However, compliance can vary by manufacturer, part design, and whether the unit is OEM or aftermarket. Always verify the compliance documentation for the specific part you're purchasing, especially if your truck is subject to state or federal emissions inspections.

What's the difference between a new, remanufactured, and OEM DPF?

A new DPF is manufactured from scratch and typically comes with the longest warranty. A remanufactured DPF has been cleaned, inspected, and rebuilt to restore function at a lower cost than new. OEM parts are made by or for Peterbilt to original specifications, while aftermarket parts are produced by third-party manufacturers and may offer a more budget-friendly alternative. Each option has tradeoffs in cost, lead time, and expected service life.

How do I know if my DPF needs to be replaced versus cleaned?

Common signs that a DPF may need attention include increased backpressure, reduced fuel economy, frequent regeneration cycles, or active fault codes related to exhaust restriction. In many cases, a clogged filter can be professionally cleaned rather than replaced, which is often more cost-effective. If the filter has physical cracks, melted substrate, or repeated failures after cleaning, replacement is usually the better long-term solution.

Can I install a replacement muffler or DPF myself, or do I need a professional?

Basic muffler replacement is often manageable for someone comfortable with exhaust system work and the right tools, including proper jack stands and exhaust clamps. DPF replacement or service is more involved, since it may require resetting soot load sensors, clearing fault codes, or recalibrating the aftertreatment system. If you're not experienced with diesel aftertreatment systems, we recommend having the installation performed by a qualified diesel technician to avoid triggering check engine lights or derates.