GMC General Truck Chrome Stacks & Tops

Frequently Asked Questions About GMC General Truck Chrome Stacks & Tops

What exactly are chrome stacks and tops, and what do they do?

Chrome stacks refer to the exhaust pipe sections that route diesel exhaust up and away from the cab, while stack tops (also called exhaust tips or rain caps) are the finishing pieces that attach to the top of the exhaust pipe. Stack tops can help direct exhaust flow, reduce water and debris entry when the truck is parked, and give the exhaust system a finished, polished look with a mirror chrome or stainless finish.

Will these stacks and tops fit my GMC General exhaust system?

Fit depends on the diameter of your existing exhaust pipe and the style of stack or top you choose. Most stacks and tops are sold by pipe diameter, such as 5 inch or 7 inch, so measuring your current exhaust pipe before ordering is the best way to confirm a proper fit. If you are unsure, our team can help you match the correct size to your GMC General setup.

What is the difference between the various stack top styles, such as turn down, bull horn, or flat top?

These terms describe the shape of the top and how it directs exhaust flow. A turn down top angles the opening to the side or downward, a bull horn style flares outward like a horn, and a flat top has a straight, open end. The style you choose is largely a matter of appearance and personal preference, since all styles are designed to work with standard exhaust pipe diameters.

How do I install a chrome stack or top, and is it a difficult job?

Most stack tops slip over or clamp onto the existing exhaust pipe and are secured with set screws or a clamp band, making them a relatively straightforward bolt-on style install that many owners handle themselves with basic hand tools. Full exhaust stack replacement is a larger job that may involve removing the old pipe section and fitting the new stack in its place, so some owners prefer to have this done by a shop, especially if cutting or welding is involved.

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

Since these parts are exposed directly to exhaust heat and outdoor conditions, regular washing with a mild soap and water solution followed by a dedicated chrome polish will help maintain shine and prevent buildup. Because engine heat and moisture can cause discoloration over time, especially at the point where the top meets the stack, wiping down the parts after rain or after extended idling can help extend their appearance and lifespan.