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Fits 1964 to 1967 Buick Gran Sport, Skylark, Special and 1 more model; 1964 to 1967 Chevrolet Chevelle, El Camino; 1964 to 1967 Oldsmobile 442, Cutlass, Cutlass Supreme and 2 more models; 1 more makes. See every vehicle
The American Thunder® Crossmember-Back exhaust system is a true dual large 3.00-inch muscle car system for the person who is looking for a deep aggressive sound for their high horsepower vehicle. This stainless steel system is mandrel-bent for maximum performance, includes an H-pipe crossover to balance out the exhaust pressures, add hp and torque, and to help eliminate back-rap on deceleration. The specially selected Super 40® Series performance mufflers feature a large case to handle the added horsepower and provide a deep muscular tone flowing through the large 3.00-inch tailpipes. The American Thunder systems generally deliver an aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. The sound level will depend greatly on the engine and level of modifications. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation. Covered by our Lifetime Limited Warranty.
Warranty: Manufacturer's Limited Lifetime Warranty
| Year | Make | Model | Submodel | Engine |
|---|---|---|---|---|
| 1965 - 1966 | Buick | Gran Sport | Base | 6.6L 401 V8 |
| 1967 | Buick | Gran Sport | Base | 5.6L 340 V8, 6.6L 400 V8 |
| 1964 | Buick | Skylark | Base | 4.9L 300 V8 |
| 1965 | Buick | Skylark | Base | 4.9L 300 V8, 6.6L 401 V8 |
| 1966 | Buick | Skylark | Base | 4.9L 300 V8, 5.6L 340 V8, 6.6L 401 V8 |
| 1967 | Buick | Skylark | Base | 4.9L 300 V8, 5.6L 340 V8, 6.6L 400 V8 |
| 1964 - 1965 | Buick | Special | Base, Deluxe | 4.9L 300 V8 |
| 1966 - 1967 | Buick | Special | Base, Deluxe | 4.9L 300 V8, 5.6L 340 V8 |
| 1964 - 1965 | Buick | Sportwagon | Base | 4.9L 300 V8 |
| 1966 | Buick | Sportwagon | Base, Custom | 5.6L 340 V8 |
| 1967 | Buick | Sportwagon | Base | 5.6L 340 V8 |
| 1964 | Chevrolet | Chevelle | 300, Malibu, Malibu Super Sport | 4.6L 283 V8, 5.3L 327 V8 |
| 1965 | Chevrolet | Chevelle | 300, 300 Deluxe, Malibu, Malibu Super Sport | 4.6L 283 V8, 5.3L 327 V8, 6.5L 396 V8 |
| 1966 | Chevrolet | Chevelle | 300, 300 Deluxe, Malibu, Super Sport 396 | 4.6L 283 V8, 5.3L 327 V8, 6.5L 396 V8 |
| 1967 | Chevrolet | Chevelle | 300, 300 Deluxe, Concours, Malibu, SS 396 | 4.6L 283 V8, 5.3L 327 V8, 6.5L 396 V8 |
| 1964 - 1965 | Chevrolet | El Camino | Base | 4.6L 283 V8, 5.3L 327 V8 |
| 1966 - 1967 | Chevrolet | El Camino | Base | 4.6L 283 V8, 5.3L 327 V8, 6.5L 396 V8 |
| 1964 | Oldsmobile | 442 | Base | 5.4L 330 V8 |
| 1965 - 1967 | Oldsmobile | 442 | Base | 6.6L 400 V8 |
| 1964 | Oldsmobile | Cutlass | Base, Holiday | 5.4L 330 V8 |
| 1965 - 1966 | Oldsmobile | Cutlass | Base, Holiday | 5.4L 330 V8, 6.6L 400 V8 |
| 1967 | Oldsmobile | Cutlass | Base, Holiday, Turnpike Cruiser | 5.4L 330 V8, 6.6L 400 V8 |
| 1967 | Oldsmobile | Cutlass Supreme | Base | 5.4L 330 V8 |
| 1964 | Oldsmobile | F85 | Base, Deluxe | 5.4L 330 V8 |
| 1965 | Oldsmobile | F85 | Base, Deluxe | 5.4L 330 V8, 6.6L 400 V8 |
| 1966 | Oldsmobile | F85 | Base, Deluxe, Holiday | 5.4L 330 V8, 6.6L 400 V8 |
| 1967 | Oldsmobile | F85 | Base | 5.4L 330 V8 |
| 1964 - 1967 | Oldsmobile | Vista Cruiser | Base, Custom | 5.4L 330 V8 |
| 1964 | Pontiac | Beaumont | Base | 4.6L 283 V8, 5.3L 327 V8 |
| 1965 - 1967 | Pontiac | Beaumont | Base | 4.6L 283 V8, 5.3L 327 V8, 6.5L 396 V8 |
| 1964 - 1966 | Pontiac | GTO | Base | 6.4L 389 V8 |
| 1967 | Pontiac | GTO | Base | 6.6L 400 V8 |
| 1964 - 1967 | Pontiac | LeMans | Base | 5.3L 326 V8 |
| 1964 - 1965 | Pontiac | Tempest | Base, Custom, Safari | 5.3L 326 V8 |
| 1966 | Pontiac | Tempest | Base, Safari | 5.3L 326 V8 |
| 1967 | Pontiac | Tempest | Base, Custom, Safari | 5.3L 326 V8 |