Description
Overview
The Flowmaster American Thunder Crossmember-Back Exhaust System is a true dual 3.00-inch muscle car system engineered to give your ride a deep, aggressive voice that matches its performance. Built from mandrel-bent aluminized steel, this system is designed for maximum exhaust flow, letting your engine breathe freely from the crossmember back through a pair of large 3.00-inch tailpipes.
At the heart of the system sits an H-pipe crossover that balances exhaust pressures between the two banks. This crossover doesn’t just clean up the sound and help eliminate back-rap on deceleration — it also works to add horsepower and torque, making the system as functional as it is loud. Paired with the specially selected Super 40 Series performance mufflers (part number 953048), the American Thunder delivers a big, muscular tone that lives up to its name.
Key Benefits
Like all Flowmaster systems, the American Thunder is built to improve throttle response, power, and mileage while producing an aggressive interior and exterior tone. The Super 40 Series mufflers are housed in a large case specifically to handle high horsepower and provide that deep, unmistakable rumble. Keep in mind that the actual sound level depends greatly on your engine and its level of modification — the more you build, the more it speaks.
- True dual 3.00-inch mandrel-bent aluminized steel construction for maximum flow
- Super 40 Series performance mufflers (P/N 953048) in a large case for high-horsepower applications
- H-pipe crossover to balance exhaust pressures, add hp and torque, and reduce deceleration back-rap
- Dual tailpipe configuration with an aggressive, deep muscular tone
- U-bolt clamping and all necessary parts and hardware included for easy installation
- CARB (California) compliant with Emission Code 5
Options & Configuration
This crossmember-back system includes the Super 40 Series mufflers and everything needed for a straightforward bolt-on installation, using U-bolt clamps for a secure, adjustable fit. Exhaust tips are sold separately, giving you the freedom to finish the look exactly how you want. Note that heat shields are not included with this system.
Fitment & Compliance
Designed specifically for 2WD applications, the American Thunder is a crossmember-back configuration that installs from the crossmember rearward. It carries CARB (California) compliance under Emission Code 5, making it a street-legal choice for enthusiasts who want their performance heard without compromise. The silver aluminized finish adds durable, understated good looks beneath the vehicle.
Whether you’re chasing better throttle response, added power, or simply a bolder exhaust note, the Flowmaster American Thunder Crossmember-Back system is engineered for the enthusiast who wants their performance to be heard. Backed by Flowmaster’s 3 Year Limited Warranty, it delivers proven flow, an aggressive tone, and easy installation in one complete package.
