Description
Overview
The Flowmaster American Thunder Crossmember-Back Exhaust System is a complete, purpose-built dual exhaust solution engineered for most 1964-1972 GM A-body cars. Built for 2WD applications, this system delivers a full 2.50-inch dual configuration designed for the enthusiast who wants a moderately aggressive exterior tone paired with a moderate, livable interior sound. From the crossmember back, everything is designed to work together for improved performance and that unmistakable American Thunder character.
At the heart of the system is a pair of specially selected Super 40 Series mufflers (muffler part number 952548), tuned to produce the aggressive-yet-refined note this series is known for. An integrated H-pipe equalizes exhaust pressures side to side, helping the engine breathe for maximum performance and a deeper, richer sound.
Key Benefits
Constructed from aluminized steel with all mandrel-bent tubing, this exhaust maintains smooth, unrestricted flow throughout its length. The mandrel-bent 2.50-inch tailpipes tuck up and out of the way to preserve maximum ground clearance while giving you a clean, factory-quality appearance in a silver finish. Like all Flowmaster systems, the American Thunder is engineered to deliver improved throttle response, added power, and better mileage.
- Complete crossmember-back 2.50-inch dual exhaust system for 1964-1972 GM A-body cars
- Pair of Super 40 Series mufflers included (P/N 952548) for a moderately aggressive tone
- H-pipe crossover to equalize exhaust pressure for max performance and deep sound
- All mandrel-bent aluminized steel tubing in a silver finish
- U-bolt clamping and all necessary parts and hardware included
- CARB (California) compliant, Emission Code 5
Tailpipe Exit Options
The mandrel-bent 2.50-inch dual tailpipes are designed to tuck up for clearance and offer two choices of tailpipe exit styles, so you can select the configuration that best matches your car and your preferred look. Exhaust tips are sold separately, letting you finish the system to your exact taste. Note that a heat shield is not included with this system.
Fitment
This American Thunder Crossmember-Back system is custom designed for most 1964-1972 GM A-body cars in 2WD configuration. With inlet diameter of 2.50 inches and dual tailpipe routing, it is intended for those seeking a complete bolt-together upgrade over stock or worn exhaust.
Installation & Warranty
Designed with easy fit in mind, the system includes all necessary parts and hardware, along with U-bolt style clamps for straightforward assembly. It is backed by Flowmaster’s 3-year Limited Warranty, giving you confidence in a system engineered for both sound and durability.
