Description
Overview
The Flowmaster American Thunder Cat-back Exhaust System is built for the enthusiast who wants the aggressive look of a NASCAR race truck combined with all the real-world benefits of a genuine Flowmaster cat-back setup. Engineered as a D.O.S.S. (Dual Out Same Side) configuration, this system routes both pipes to one side of the vehicle for that unmistakable stance and sound, making it a standout upgrade for anyone who wants their performance to be seen and heard.
At the heart of the system is a performance muffler from the 50 Series HD family, tuned to deliver a moderately aggressive exterior tone paired with a moderate interior sound level. The result is a bold, purposeful voice under acceleration without an overbearing drone inside the cab — an ideal balance for daily driving and weekend performance alike.
Key Benefits
Like all Flowmaster systems, the American Thunder cat-back is designed to do more than just sound great. The dual 2.50-inch mandrel-bent tailpipes promote smooth exhaust flow, helping to improve throttle response, power, and mileage. The pipes exit in front of the right side rear tire and are finished with dual 3.00-inch polished stainless steel tips for a clean, high-quality appearance that complements the aggressive sound profile.
Every component is engineered for an easy fit. The system arrives with the muffler included and all the necessary parts and hardware for straightforward installation, so you can get the upgrade done and get back on the road with confidence.
- American Thunder series cat-back exhaust with D.O.S.S. (Dual Out Same Side) design
- 50 Series HD performance muffler included for a moderately aggressive exterior and moderate interior tone
- Dual 2.50-inch mandrel-bent tailpipes for improved flow
- Dual 3.00-inch polished stainless steel exhaust tips exiting in front of the right side rear tire
- Improved throttle response, power, and mileage
- Includes all necessary parts and hardware for easy installation
- Backed by a 3-year Limited Warranty
Fitment & Compliance
This system is designed for 2WD applications and features a 2.50-inch inlet diameter with dual muffler inlet locations and dual tailpipe exits. It carries an Emission Code of 5 and is CARB (California) compliant, so it meets the requirements for legal use in states that follow California emissions standards. Please note the California Proposition 65 warning applies to this product.
Whether you’re chasing a more assertive exhaust note, a truck-inspired appearance, or the added throttle response and efficiency a quality cat-back can deliver, the Flowmaster American Thunder system brings proven performance and style together in one complete kit.
