Description
Overview
The Flowmaster American Thunder Crossmember-Back Exhaust System is a complete, purpose-built upgrade engineered specifically for 1967-1972 Chevrolet and GMC C10 and C15 1/2 ton 2WD trucks with coil spring suspension. Designed for the classic truck enthusiast who wants a moderate to aggressive sound level both inside and outside the cab, this American Thunder kit transforms your factory exhaust into a true performance system without guesswork. Starting from the crossmember and working back, it delivers the flow, tone, and clearance a lowered classic hauler deserves.
At the heart of the system is a built-in H-pipe crossover paired with a set of Super 44 Series performance mufflers, giving you that unmistakable Flowmaster growl that stays aggressive under throttle yet remains livable at cruise. All tubing is 2.50-inch mandrel-bent aluminized steel with a silver finish, ensuring smooth flow through every bend and durable construction that stands up to the road.
Choose Your Tailpipe Exit
Flexibility is built in. You can select from four distinct dual tailpipe configurations to match the look and stance of your truck: one set slightly angled down to clear larger rear bumpers, one set straight out the back under the rear bumper, a set exiting out the sides behind the rear tires for that classic truck look, or a dump style that exits behind the rear tires level with the body. Whatever your preference, the system provides adequate clearance for substantially lowered vehicles.
Key Highlights
- Complete crossmember-back system with built-in H-pipe crossover for balanced flow and tone
- Mandrel-bent 2.50-inch aluminized steel tubing with a silver finish
- Pair of Super 44 Series performance mufflers for a moderate to aggressive sound level
- Four selectable dual tailpipe exit styles to fit your truck and taste
- U-Bolt clamping and all necessary installation hardware included
- CARB (California) compliant, Emission Code 5
Fitment
This kit is designed exclusively for 1967-1972 Chevrolet and GMC C10 and C15 1/2 ton 2WD trucks equipped with coil spring suspension, and it fits both short and long wheelbase trucks. Because it is engineered as a direct application system, you get proper routing, clearance, and hangers without cutting corners. Please note that mufflers are included as part of the kit, while exhaust tips are sold separately and no heat shield is included.
Warranty
The American Thunder aluminized system is backed by a 3-Year Limited Warranty. If you prefer stainless steel construction, consider system #817654, which is covered by a Lifetime Limited Warranty. Whichever route you choose, you’re getting a proven Flowmaster system that combines classic truck style with real performance sound.
