STACKS

Exhaust Stacks For Peterbilt Trucks

The vertical exhaust stack is one of the most iconic visual elements on a Peterbilt conventional, routing exhaust up and away from the cab while defining the truck's classic silhouette. Chrome and aluminized stacks are available in straight and angled configurations, with rain cap and no-cap options to suit different preferences and applications. We carry exhaust stacks for Peterbilt trucks in the diameters and lengths needed for common cab and sleeper configurations.

Frequently asked questions about exhaust stacks

What diameter exhaust stack does a Peterbilt typically use?

Most Class 8 Peterbilt trucks use 5-inch exhaust stacks, which is the standard diameter for heavy-duty diesel exhaust systems. Some older or specialty configurations use 4-inch or 6-inch stacks. The diameter should match the exhaust pipe exiting the muffler -- using a stack with a different diameter than the upstream pipe requires an adapter and is not the preferred approach. Always confirm the diameter of your existing exhaust outlet before ordering a replacement stack.

What is the difference between a chrome stack and an aluminized steel stack?

Chrome stacks have a bright, polished appearance that's popular on show trucks and owner-operators who prioritize aesthetics. Chrome requires more maintenance to keep looking its best -- it can develop rust spots if the plating is damaged and needs regular polishing. Aluminized steel stacks have a satin silver finish that's more resistant to corrosion from the inside (from condensation and exhaust moisture) and requires less maintenance. For a working truck, aluminized is the more practical choice; for a truck where appearance is a priority, chrome is the traditional selection.

Do I need a rain cap on my Peterbilt exhaust stack?

A rain cap prevents water from entering the stack when the truck is parked, which is especially important for trucks that sit outdoors for extended periods. Without a rain cap, water in the stack can cause corrosion and in cold weather can freeze, potentially restricting exhaust flow on startup. Rain caps are spring-loaded and blow open with exhaust pressure when the engine is running, so they don't restrict exhaust flow during operation. For most working trucks parked outdoors, a rain cap is a worthwhile addition.

Other parts you might need

Shop exhaust parts for Peterbilt trucks