MUFFLERS, GUARDS & BRACKETS

Mufflers, Guards & Brackets For Peterbilt Trucks

The exhaust muffler on a Peterbilt truck reduces engine noise to within EPA and local sound ordinance limits while managing exhaust backpressure in a way that minimizes impact on engine performance. Heat shields and exhaust guards protect surrounding components and cab structure from radiant exhaust heat, while mounting brackets secure the muffler and exhaust stack to the chassis. We carry mufflers, stack configurations, guards, and mounting hardware for Peterbilt trucks across current and prior model years. Note: Please verify this page URL is correct before publishing.

Frequently asked questions about mufflers, guards & brackets

When should a Peterbilt muffler be replaced?

A muffler should be replaced when it develops holes or rust-through that allows exhaust to escape before the outlet, when internal baffles collapse and create a rattling noise, or when backpressure measurements indicate the muffler is restricting exhaust flow beyond the engine manufacturer's specification. On Peterbilts equipped with diesel particulate filters (DPF), the aftertreatment system handles much of the exhaust management, but the muffler still plays a role in noise attenuation and exhaust routing. An exhaust leak at the muffler is both a noise violation risk and a potential cab infiltration hazard.

What are exhaust heat shields and why are they important?

Exhaust heat shields are metal guards that surround or are positioned adjacent to exhaust components — mufflers, pipes, and stacks — to deflect radiant heat away from fuel lines, wiring harnesses, cab structure, and other temperature-sensitive components. On Peterbilt trucks, heat shields are particularly important around turbocharger outlets and mid-pipe sections where exhaust temperatures can exceed 1,000°F. Missing or damaged heat shields are a fire risk, particularly if a fuel or oil leak is present near the exhaust system. Replace cracked, corroded, or missing heat shields promptly.

How do I prevent muffler and exhaust bracket failures on a Peterbilt?

Muffler and exhaust bracket failures are most often caused by corrosion from road salt and moisture, vibration fatigue at weld points, or overtightening of clamps that restricts natural thermal expansion. Inspect all exhaust hangers, brackets, and clamps at every PM interval — look for cracks at weld joints, elongated mounting holes, and corrosion that has thinned the bracket metal. Apply anti-seize compound to all exhaust hardware on reassembly to prevent thread galling and to facilitate future service. Replace hardware showing more than surface rust before it fails completely and allows the exhaust system to shift or drop.

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