Description
Overview
The Flowmaster American Thunder Crossmember-Back Exhaust System is a complete, purpose-built dual exhaust upgrade for the person who wants their classic Chevy to sound as good as it looks. Engineered specifically for 1964 to 1972 Chevrolet/GMC El Camino/Sprint models equipped with a V8 engine and 2WD, this system delivers a moderately aggressive tone that makes your performance heard on the outside while keeping the interior comfortable and livable. From the crossmember back, every component is designed to work together for a clean install and a powerful result.
Constructed from 2.50-inch mandrel-bent aluminized steel, the American Thunder system flows freely and resists the kinks and restrictions of lesser bends. A built-in H-pipe equalizes exhaust pressures between the two banks, eliminates backrap on deceleration, and helps the engine make maximum power. It’s the kind of engineering detail that separates a true performance exhaust from a bolt-on that just adds noise.
Sound & Performance
At the heart of the system is a matched pair of Super 50 Series mufflers (muffler part number 52558), specially selected to produce a deep, powerful exterior sound with minimal interior drone. That tuning makes this the ideal choice for the enthusiast who wants an aggressive presence at the curb without an overwhelming tone inside the cab. Like all Flowmaster systems, the benefits reach beyond sound: expect improved throttle response, added power, and better mileage.
Style & Fitment
The mandrel-bent tailpipes exit at an angle behind the rear wheels and are finished with large 3.00-inch angle-cut polished stainless tips, giving your El Camino or Sprint a purposeful, aggressive look to match the sound. Dual tailpipes complete the classic muscle-car stance. Designed with easy fit in mind, the system uses U-bolt clamping and includes all the necessary parts and hardware for a straightforward installation.
- Complete crossmember-back dual exhaust system for 1964–1972 Chevrolet/GMC El Camino/Sprint with a V8, 2WD
- 2.50-inch mandrel-bent aluminized steel construction with a built-in H-pipe
- Pair of Super 50 Series mufflers (P/N 52558) for a deep exterior tone with minimal interior noise
- Mandrel-bent tailpipes with 3.00-inch angle-cut polished stainless tips
- Aggressive/moderate sound level with U-bolt clamping
- CARB (California) compliant, Emission Code 5
- Includes all necessary parts and hardware for installation
Whether you’re chasing better throttle response, more power, or simply the unmistakable rumble of a properly tuned V8, the Flowmaster American Thunder Crossmember-Back system delivers a balanced blend of performance, sound, and style built to bolt on and enjoy. Please note this product carries a California Proposition 65 warning and a heat shield is not included.
