5.5 Inch Diameter

Understanding the 5.5-Inch Exhaust Stack

The 5.5-inch exhaust is a large diameter most common on the back of a working Class 8 truck. Measuring 5.5 inches across the tube, it moves the heavy exhaust volume a road tractor produces while adding that unmistakable big-rig stack presence. For owner-operators and fleets, a 5.5-inch exhaust stack is as much a mark of a well-kept rig as it is a functional part of the system.

Whether you are swapping a dented stack, replacing a rusted-through pipe, or dressing up a cab, we stock the 5.5-inch components to get it done right.

Where the 5.5-Inch Size Fits

Most 5.5-inch exhaust systems are on heavy over-the-road trucks, but the size also fits large diesel equipment and industrial engines that move high exhaust volume. 

On a road tractor, it typically runs as a vertical stack behind the cab, carrying gases up and away from the trailer and the load. On stationary and off-highway machines, that same generous diameter keeps flow strong and back pressure low. 

If your engine works for a living, the 5.5-inch size gives it room to breathe without choking down performance. Plus, many rigs run a matched pair of 5.5-inch stacks, so a clean, straight set does as much for the look of the truck as it does for exhaust flow.

5.5-Inch Exhaust Parts and Accessories

Our 5.5-inch selection covers the full setup:

• Straight and curved exhaust stacks in aluminized and stainless finishes
• Replacement pipe for runs behind the cab and along the frame
• Reducers and adapters to connect to 5-inch, 6-inch, and other sizes
• Clamps, brackets, and stack mounts sized for large-diameter tube
• Flex connectors that soak up vibration on rough roads and job sites

Order it all together and every joint lines up, so you spend your time driving instead of chasing mismatched fittings. We also carry the rain caps, heat shields, and finishing hardware that keep a stack looking sharp season after season.

Why Buy Your 5.5-Inch Exhaust From Truck Pipes USA?

Start with service. Our US-based team knows exhaust and knows trucks, so you get straight answers and the right 5.5-inch parts the first time, not a runaround. That product knowledge is why customers call us instead of guessing with a generic parts catalog.

You also get one of the widest 5.5-inch assortments anywhere, from replacement stacks to the clamps and mounts that finish the job, all in a single order. Most parts are made in North America and produced to IATF 16949:2016 standards, so the quality holds up mile after mile. And because these are aftermarket components, you get that durability at a price that respects your bottom line. For a part that rides where everyone can see it, the mix of fit, finish, and value is hard to beat.

Browse our full 5.5-inch diameter exhaust selection, or reach out for help matching the exact stack, pipe, or fitting your truck needs, built by people who understand what a clean, quiet rig means to the driver behind the wheel.