Description
Overview
The Flowmaster American Thunder Cat-back Exhaust System is engineered for the enthusiast who wants a complete, ready-to-install dual exhaust upgrade with an unmistakably aggressive tone. Part of Flowmaster’s respected American Thunder series, this system pairs proven flow technology with a bold exterior sound and a moderate, livable interior tone — giving you the muscle-car presence you want without the drone that wears you down on long drives.
At the heart of the kit is the acclaimed Super 40 Series muffler, specially selected to deliver that signature aggressive exterior note. Every tube is mandrel bent for smooth, unrestricted flow, helping the engine breathe more freely from the catalytic converter back through the dual tail pipes. The result is a cat-back system that both looks and sounds like serious performance hardware.
Key Benefits
Like all Flowmaster systems, the American Thunder is designed to do more than sound great. The free-flowing, mandrel-bent design supports improved throttle response, added power, and better mileage — real, functional gains that back up the aggressive attitude. With a 3.00-inch inlet diameter and dual tail pipe configuration, this system is built to move exhaust gases efficiently while giving your vehicle a purposeful, dual-outlet stance.
- Complete cat-back dual exhaust system with everything needed for installation
- Super 40 Series muffler included for an aggressive exterior tone
- Mandrel-bent tubing for maximum flow and performance
- 3.00-inch inlet diameter with dual tail pipe outlets
- Aggressive exterior sound paired with a moderate interior tone
- Silver-finish piping with a factory-quality appearance
- CARB (California) compliant — Emission Code 5
Sound Character
Flowmaster tuned this system to strike a balance that enthusiasts appreciate. Outside the vehicle you get a deep, aggressive presence that announces your ride. Inside the cabin, the tone stays moderate and comfortable, making the American Thunder well suited to daily driving as well as spirited weekend runs. It’s the kind of exhaust note that turns heads at a cruise-in without overwhelming your commute.
Installation & Fitment
Designed with easy fit in mind, the American Thunder system includes all necessary parts and hardware for a straightforward installation. This configuration is built for 2WD applications and ships as a kit only. Because it is CARB compliant, it’s a smart choice for owners in California and other emissions-regulated states who want an aggressive upgrade that stays street legal.
Always confirm the correct application for your specific vehicle before ordering. Note: this product carries a California Proposition 65 warning. Choose the Flowmaster American Thunder when you want a proven, complete cat-back system that combines aggressive style, smart engineering, and easy bolt-on installation.
