Kenworth W900A Chrome Stacks & Tops

Frequently Asked Questions About Kenworth W900A Chrome Stacks & Tops

What exactly are "stacks" and "tops" in this category?

Stacks refer to the exhaust pipe sections that run from the muffler or turbo up through the cab to release exhaust above the truck, while tops (also called stack tops, rain caps, or turn-down tops) are the decorative and functional end pieces that attach to the top of the stack. This category includes both straight and curved chrome exhaust stack pipes as well as a variety of top styles for finishing off the exhaust system on a Kenworth W900A.

Will these stacks and tops fit my specific W900A exhaust setup?

Fit depends on the diameter of your existing exhaust piping, the length you need, and how your truck's exhaust system is configured from the factory or through prior modifications. Most stacks are offered in common diameters such as 5 inch and 6 inch, so it's important to measure your current pipe before ordering. If you're unsure, our team can help you match the correct size based on your truck's specifications.

What materials and finishes are available, and how do they hold up over time?

Chrome stacks and tops are typically made from stainless steel or aluminized steel with a chrome-plated finish for that classic bright, reflective look. Stainless steel options generally offer better long-term corrosion resistance, especially in areas with road salt or heavy weather exposure. Regular washing helps maintain the chrome shine and prevents heat discoloration or surface staining over time.

Do I need any special tools or professional help to install a stack or top?

Basic stack and top installations often involve simple clamp connections and can be done with common hand tools if you're comfortable working underneath or around the cab. However, because stacks run through the frame and cab area and connect to the exhaust system, many owners prefer to have a qualified technician handle installation to ensure proper fit, secure clamping, and safe heat clearance from other components.

Are there any regulations I should be aware of when choosing exhaust stacks or tops?

Exhaust stack height, placement, and emissions-related components can be subject to state and federal regulations, particularly if your truck has emissions control equipment like a DPF or SCR system integrated into the exhaust path. Turn-down tops and rain caps are generally cosmetic and functional additions rather than emissions components, but it's a good idea to check your local regulations and ensure any modifications keep your exhaust system compliant.