Description
Overview
The Flowmaster American Thunder Cat-back Exhaust System is engineered for the truck owner who wants a bold, aggressive exterior sound while keeping the cabin comfortable and drone-free. Built specifically for 2011-2018 Chevrolet Silverado and GMC Sierra 1500 trucks equipped with the 6.2L engine, this complete bolt-on kit delivers a muscular tone, a polished appearance, and a straightforward at-home installation using your factory hanger locations.
At the heart of the system is the proven 50 Series HD performance muffler, featuring large 4.00-inch internals and a built-in tuned resonance chamber designed to minimize interior drone. A 3.50-inch mandrel-bent inlet pipe feeds air smoothly into the muffler, while dual 2.50-inch mandrel-bent tailpipes carry it out through large 3.50-inch polished stainless steel tips with an embossed logo for a clean, finished look.
Key Benefits
This American Thunder system strikes the balance many truck owners are after: an aggressive sound outside paired with a moderate tone inside. Because it uses the factory hanger locations, installation is a true bolt-on job with all necessary parts and hardware included, making it a satisfying weekend upgrade you can tackle in your own garage.
- 50 Series HD performance muffler with 4.00-inch internals and a tuned resonance chamber to reduce interior drone
- 3.50-inch mandrel-bent inlet pipe and dual 2.50-inch mandrel-bent tailpipes for smooth flow
- Large 3.50-inch polished stainless steel tips with an embossed logo
- Silver-finish stainless construction with a durable, corrosion-resistant build
- Mounts to factory hangers — no cutting into stock brackets required
- CARB (California) compliant, Emission Code 5
Choose Your Exit Configuration
This system gives you flexibility in how the tailpipes exit. Select the side-exit configuration to route the dual tailpipes out behind the rear tires, an ideal choice if you do a lot of towing. Or opt for the straight-out exit under the rear bumper for a more muscular, purposeful stance. Choose the layout that best matches how you use your truck and the look you want.
Fitment
This American Thunder Cat-back is designed for 2011-2018 Silverado and Sierra 1500 trucks with the 6.2L engine, in both 2WD and 4WD configurations. It fits Crew Cab/Short Bed (143.5″ WB), Crew Cab/Standard Bed (153″ WB), and Double Cab/Standard Bed (143.5″ WB) models. Verify your cab, bed, and wheelbase before ordering to ensure a proper fit.
Backed by Flowmaster’s Lifetime Limited Warranty, this cat-back system pairs performance-minded flow with a signature aggressive sound, giving your truck the tone and appearance it deserves. Please note the muffler is supplied as part of the kit only, and no heat shield is included.
