Kenworth W990 Chrome Stacks & Tops

Frequently Asked Questions About Kenworth W990 Chrome Stacks & Tops

What exactly are chrome stacks and tops?

Chrome stacks refer to the exhaust stack pipes that run vertically behind the cab of your Kenworth W990, while tops (also called stack tops or rain caps) are the caps or covers that fit on top of the stack to keep moisture and debris out. This category includes both the chrome-plated exhaust pipe sections and the various top styles used to finish off the stack.

Will these stacks and tops fit my specific W990 setup?

Fitment depends on the diameter and length of your existing exhaust system, as well as whether your truck uses a single or dual stack configuration. Always check the listed diameter (commonly 5 inch or 7 inch) and overall length against your current setup before ordering, and reach out to our team if you are unsure which size your truck requires.

What are stack tops made of, and which style should I choose?

Most tops are constructed from stainless steel or chrome-plated steel for durability and long-term shine. Style options typically include straight cut, curved, angle cut, and turnout tops, which are largely a matter of appearance rather than function, though some drivers prefer certain styles to help direct exhaust and rain runoff away from the cab.

How do I keep chrome stacks looking new and prevent rust or discoloration?

Regular washing with a mild soap and water solution, along with a dedicated chrome polish, will help maintain the finish. Heat discoloration near the top of the stack is common due to exhaust temperatures, so using a heat-resistant chrome cleaner and avoiding abrasive pads will help preserve the plating over time.

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

Basic hand tools such as clamps, wrenches, and sometimes a drill are typically all that is needed for installation, and many drivers install these themselves. However, if your setup involves cutting, welding, or modifying existing exhaust piping, it is a good idea to have a qualified shop handle the installation to ensure a proper, secure fit.