Peterbilt 389 Glider Chrome Stacks & Tops

Frequently Asked Questions About Peterbilt 389 Glider Chrome Stacks & Tops

What exactly are chrome stacks and tops, and are they functional or decorative?

Chrome stacks refer to the exhaust stack pipes that run up the back of the cab on a Peterbilt 389 glider, while tops (also called stack caps or curved tops) are the angled or curved end pieces that cap off the stack pipes. These are functional exhaust components that route engine exhaust up and away from the truck, but they are also a major styling element, which is why chrome finishes and custom top shapes are so popular in the glider and custom truck community.

Will these stacks and tops fit my specific Peterbilt 389 glider?

Stack diameter, length, and mounting configuration can vary depending on how your glider was built and what exhaust system is already in place. Before ordering, check the diameter of your existing stack pipe and the style of connection (slip-fit, weld, or clamp) so the replacement stack or top matches up correctly. If you are unsure, it is worth measuring your current setup or reaching out to our team with your truck's specs so we can help confirm fit.

What is the chrome finish made of, and how long will it hold up?

Most chrome stacks and tops in this category are constructed from stainless steel or mild steel with a chrome-plated finish. Stainless steel tends to resist heat discoloration and corrosion better over time, especially near the top where exhaust heat and weather exposure are highest. Regular washing helps maintain the shine and prevents road grime or exhaust residue from etching into the chrome finish.

How difficult is it to install new stacks or tops myself?

Installation difficulty depends on whether you are replacing just the top cap or the entire stack pipe. Swapping a top is usually straightforward and can often be done with basic hand tools if the fit matches your existing pipe diameter. Replacing full stacks is a bigger job that may involve unbolting or unclamping the old pipe, securing the new one to the exhaust manifold or muffler outlet, and making sure it is mounted straight and properly supported. If you are not comfortable with exhaust work, having a shop handle the installation is a safer bet.

Will chrome exhaust stacks affect emissions compliance or cause any issues with inspections?

Chrome stacks and tops themselves are typically just the visible exhaust piping and do not alter the engine's emissions system, so swapping to a chrome version generally does not affect emissions compliance on its own. That said, always make sure the stack height, diameter, and routing still meet any applicable state or DOT regulations for exhaust placement, and confirm your glider's exhaust system as a whole remains compliant with any inspection requirements in your area.