Frequently Asked Questions About Mack CV/GU Truck Chrome Stacks & Tops

Will these chrome stacks fit my specific Mack CV or GU model year?

Our chrome stacks are designed to fit Mack CV series trucks (2000-2020) and GU series trucks (2003-2015). However, fitment can vary based on your specific configuration, especially if you have aftermarket exhaust modifications. We recommend checking your current stack diameter and comparing it to our product specifications. Most CV/GU models use 5-inch diameter stacks, but some specialty configurations may require 6-inch or 7-inch options. Contact our support team with your VIN if you need help confirming compatibility.

What's the difference between 304 and 430 stainless steel stacks, and which should I choose?

304 stainless steel stacks offer superior corrosion resistance and maintain their mirror finish longer, making them ideal for trucks operating in harsh weather conditions or coastal areas with salt exposure. 430 stainless steel stacks are more budget-friendly and still provide good durability for most applications, though they may require more frequent polishing in severe conditions. For Mack CV/GU trucks that see heavy-duty use or winter road salt, we typically recommend 304 stainless for the best long-term appearance and durability.

Can I install these chrome stacks myself, or do I need a professional?

Most chrome stack installations on Mack CV/GU trucks can be completed by experienced DIYers with basic tools. You'll typically need a socket set, torque wrench, and exhaust clamps. The process usually takes 2-3 hours and involves removing the old stack, cleaning the mounting area, and securing the new stack with proper clamps. However, if you're installing a different diameter stack than your original or adding stack extensions, professional installation may be recommended to ensure proper exhaust flow and secure mounting.

What stack styles and finishes are available for my Mack CV/GU?

We offer several popular styles for Mack CV/GU trucks including straight cut, curved top, miter cut, and bull hauler styles. Finishes include mirror-polished chrome, brushed stainless, and powder-coated black chrome. The most common configuration for CV/GU models is the 5-inch diameter, 48-inch length straight cut with mirror polish. We also carry stack tops including plain, vented, and weighted rain caps that help reduce cab soot while maintaining that classic chrome look.

How do I maintain the chrome finish and prevent discoloration?

To maintain your chrome stacks' appearance, clean them every 2-4 weeks using a quality chrome polish and microfiber cloth. For Mack CV/GU trucks that idle frequently, heat discoloration near the base is common - this can be minimized by using heat shields or wraps on the lower portion. Avoid using abrasive cleaners or steel wool, which can scratch the finish. In winter months, rinse stacks weekly to remove road salt. Many drivers apply a thin coat of high-temperature wax after polishing to make future cleaning easier and provide extra protection.