Description
Overview
The Flowmaster American Thunder Cat-back Exhaust System is a complete dual exhaust upgrade built for drivers who want a moderately aggressive exterior tone paired with a controlled, moderate interior sound. Engineered around Flowmaster’s American Thunder series, this system replaces the restrictive factory piping from the catalytic converter back, letting your engine breathe more freely while delivering the deep, unmistakable character Flowmaster is known for.
At the heart of the design is dual 2.50-inch mandrel-bent tubing that flows into Flowmaster’s exclusive Scavenger Series X-pipe. This X-pipe layout is engineered for maximum scavenging performance, helping the system produce a deep, unique tone while improving exhaust flow. From there, the tubing feeds into a pair of specially selected Super 40 Series performance mufflers, which offer more internal volume than many competing brands’ mufflers and easily handle the flow demands of the Hemi engine.
Key Benefits
Every component is designed with an easy, at-home fit in mind. The system uses factory hanger locations and the mandrel-bent tailpipes exit into the factory rectangular exhaust tips, so installation is straightforward and the finished look integrates cleanly with the vehicle. All necessary parts and hardware are included, making this a genuinely complete cat-back package rather than a partial kit.
- Complete cat-back dual exhaust system with moderately aggressive exterior tone and moderate interior tone
- Dual 2.50-inch mandrel-bent tubing for smooth, high-flow performance
- Exclusive Scavenger Series X-pipe design for maximum scavenging and a deep, unique tone
- Pair of Super 40 Series performance mufflers (muffler part number 852546) with generous internal volume
- Uses factory hanger locations and exits into the factory rectangular exhaust tips
- Includes all necessary parts and hardware for a straightforward home installation
- CARB (California) compliant, Emission Code 5
Sound & Performance
The Super 40 Series mufflers deliver the aggressive sound level this setup is built for, while the X-pipe adds depth and refinement to the tone. Together they easily accommodate the flow demands of the Hemi engine, giving you meaningful exhaust performance without an overly harsh cabin drone on the highway.
Fitment & Configuration
This system is configured for 2WD applications and features dual tailpipes in a silver pipe finish. Note that exhaust tips are sold separately and no heat shield is included, so you can tailor the finishing details to your build. The system is CARB compliant (Emission Code 5) and carries a California Proposition 65 warning. Verify your specific vehicle application before ordering to ensure correct fitment.
Backed by Flowmaster’s Lifetime Limited Warranty, the American Thunder cat-back gives you a proven, flow-optimized exhaust upgrade you can install and enjoy with confidence.
