Description
Overview
The Flowmaster American Thunder Crossmember-Back Exhaust System is a complete, purpose-built dual exhaust upgrade engineered for 1955-1957 Chevy coupes and sedans. Designed for the enthusiast who wants the whole system in one package, this American Thunder setup delivers Flowmaster’s signature performance and sound while dropping right into your classic tri-five Chevy. Every component from the crossmember back is included, giving you a cohesive, high-quality exhaust that looks as purposeful as it performs.
Constructed from 2.50-inch mandrel-bent stainless steel, this system is built for both maximum performance and long-term durability. Mandrel bending keeps the pipe diameter consistent through every bend, promoting smooth exhaust flow that helps improve throttle response, power and mileage. A built-in H-pipe smooths out the tone, delivering a mellow, refined note while eliminating back rap on deceleration.
Sound & Performance
At the heart of the system is a matched pair of Super 40 Series performance mufflers. These deliver a deep, aggressive exterior sound paired with a moderate interior tone, so your tri-five makes its presence known outside while keeping the cabin comfortable on the highway. It’s the balance many classic Chevy owners are after: an unmistakable American Thunder growl without a droning ride.
Design & Fitment
The dual tailpipes are tucked up high for improved clearance and exit straight out the back beneath the rear bumper for a clean, integrated appearance. This is a 2WD, crossmember-back configuration that includes all the necessary parts and hardware for a straightforward installation. It is CARB (California) compliant, making it a smart choice for owners in emissions-regulated states.
- Complete crossmember-back dual exhaust system for 1955-1957 Chevy coupes and sedans
- 2.50-inch mandrel-bent stainless steel construction for flow and longevity
- Pair of Super 40 Series performance mufflers included
- Built-in H-pipe for a mellow, smooth tone and no back rap on deceleration
- Dual tailpipes tucked high for clearance, exiting straight out the back under the rear bumper
- Silver pipe finish; heat shields not included
- CARB compliant and backed by a Lifetime Limited Warranty
Please note this system is designed specifically for 1955-1957 Chevy coupes and sedans and does not fit wagons or convertibles. With everything needed included in the kit, from mufflers to hardware, you get a purpose-engineered upgrade that restores authentic performance sound to your classic Chevy while improving how it breathes.
Warning: This product carries a California Proposition 65 warning.
