Description
Overview
The Flowmaster American Thunder Cat-back Exhaust System is engineered for owners of 2011-2019 Chevy Silverado and GMC Sierra 2500HD/3500HD trucks equipped with the 6.0L engine who want a bolder exhaust note and the performance benefits that come with a genuine Flowmaster upgrade. Part of the respected American Thunder series, this complete cat-back kit delivers a moderate to aggressive sound level both inside and outside the cab, giving your heavy-duty truck a deeper, more purposeful tone without sacrificing everyday drivability.
At the heart of the system is a stainless steel 50 Series HD muffler, tuned to produce the assertive sound that Flowmaster is known for. Backing it up are large dual 3.00-inch stainless steel mandrel-bent tailpipes that promote smooth exhaust flow, all fed by a 3.50-inch inlet. The kit is finished with beautifully polished 4.00-inch stainless steel tips for a clean, aggressive appearance that matches the sound.
Configurable Exit Options
Flexibility is built in. The dual tailpipes can be configured to exit either dual out the sides or dual straight out the back, so you can dial in the look and clearance that best suits your truck. Choose the exit style that fits your setup and preferences.
Key Benefits
- Moderate to aggressive sound level, heard both inside and outside the cab
- Stainless steel 50 Series HD muffler for durable, signature Flowmaster tone
- Dual 3.00-inch stainless steel mandrel-bent tailpipes with a 3.50-inch inlet for smooth flow
- Polished 4.00-inch stainless steel tips for a finished, aggressive look
- Side-exit or straight-back exit configuration
- Bolt-on, emissions-legal design that includes all necessary parts and hardware
Emissions & Warranty
This is an emissions-legal, CARB (California) compliant system carrying Emission Code 5, making it a smart choice for owners who need to stay compliant while upgrading. It is also covered by Flowmaster’s Lifetime Limited Warranty. Note that this product carries a California Proposition 65 warning.
Fitment
This system is designed specifically for 2011-2019 Chevy Silverado and GMC Sierra 2500HD/3500HD trucks with the 6.0L engine, in Crew Cab, Standard Bed (6.5 ft.) configuration with the 153.7-inch wheelbase, in 2WD applications. It is designed for an easy fit and includes everything needed for installation. The kit ships as a complete cat-back system with the muffler included; a heat shield is not included.
If you’re after that unmistakable Flowmaster growl combined with proven performance flow and durable stainless construction, the American Thunder Cat-back is a straightforward, bolt-on way to transform how your heavy-duty truck sounds and performs.
