Description
Overview
The Flowmaster American Thunder Crossmember-Back Exhaust System is engineered for the classic Chevrolet enthusiast who wants a genuine performance upgrade without compromising the character of a legendary muscle car. Purpose-built for 1965-1968 Chevrolet Impala and Caprice models, this bolt-on system delivers the moderate-to-aggressive tone Flowmaster is known for, both inside and outside the car, backed by the flow and craftsmanship you expect from the American Thunder series.
At the heart of the kit are a pair of Super 40 Series mufflers, tuned to produce a deep, aggressive-yet-moderate sound level that comes alive under throttle while staying comfortable at cruise. The complete crossmember-back design uses mandrel-bent 2.50-inch aluminized steel tubing with a built-in H-pipe crossover to smooth exhaust scavenging and balance flow from side to side, then finishes strong with dual 2.50-inch mandrel-bent tailpipes.
Key Benefits
Because every bend is mandrel-formed, the tubing maintains a consistent internal diameter through each curve, protecting exhaust velocity and helping your engine breathe. The flanged mount connections make for a straightforward, repeatable fit, and the system arrives with all necessary parts and hardware for installation, so you have what you need to get the job done. A pair of polished oval stainless steel tips caps the setup with a clean, finished appearance at the rear.
- Crossmember-back configuration with mandrel-bent 2.50-inch aluminized steel tubing
- Built-in H-pipe crossover for balanced flow and a fuller tone
- Dual Super 40 Series mufflers included, delivering a moderate-to-aggressive sound
- Dual 2.50-inch mandrel-bent tailpipes with polished oval stainless steel tips
- Flanged connections plus all necessary installation parts and hardware included
- CARB (California) compliant and covered by a 3-year Limited Warranty
Sound & Performance
The Super 40 Series muffler pairing strikes a deliberate balance: aggressive enough to announce your presence, yet moderate enough to live with day to day. Combined with the 2.50-inch mandrel-bent path and H-pipe crossover, the American Thunder system brings the performance benefits and unmistakable exhaust note that make this series a favorite among classic Chevy owners.
Fitment
This system is designed as an easy fit for 1965-1968 Chevrolet Impala and Caprice models in 2WD configuration, and it fits coupes, wagons, and convertibles. Big Block cars will need the Flowmaster #81075 manifold down-pipe kit to connect the system to the factory manifolds. Please note the muffler is supplied as part of the kit only, no separate heat shield is included, and this product carries a California Proposition 65 warning.
Restore the sound and performance your classic Chevy deserves with a complete, ready-to-install exhaust package from Flowmaster.
