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Flowmaster Classic Exhaust Systems

- Classic Exhaust System Types
Flowmaster's Classic Exhaust Systems can be found in two different muffler configurations ranging from mild to wild. If you're looking for an aggressive tone the American Thunder is for you. If you're looking for more of a moderate exhaust tone but still packs a big punch check out the Force II systems. - Materials
Flowmaster uses many different materials when it comes to building completely custom systems to bolt directly on to your vehicle. Most of our kits are made from an extremely durable 409S stainless steel with some of our older systems being made from the tested and reliable aluminized steel. - Vehicle Support
We have you covered for your classic hot rod! Flowmaster technicians personally hand-select the right muffler, tubing size, resonator, and tip to make the process easy for you.
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FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1964-1972 GM A-Body with V8 engines, 2.5" pipes - Aluminized Steel - Aggressive to moderate soundAdvertised Price $799.95$718.95Save $81.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1968 Camaro and Firebird with V8 engine. 2.50 inch Aluminized Steel - Aggressive to moderate soundAdvertised Price $699.95$628.95Save $71.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1964-1967 GM A-Body with V8 engine, 2.5" Stainless Steel Pipes. - Aggressive to moderate soundAdvertised Price $921.95$828.95Save $93.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1969 Chevrolet Camaro and Pontiac Firebird, 3.0 inch Aluminized Pipes - Aggressive soundAdvertised Price $999.95$898.95Save $101.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1972 Chevrolet/GMC C10, C15 1/2 ton trucks with V8 engines. Stainless Steel. - Aggressive to moderate soundAdvertised Price $972.95$874.95Save $98.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1972 Ford F-100/250/350 V8 Without Side Tank, 2WD Short and Long Bed, 2.5" 409 Stainless Steel, Dual ExitAdvertised Price $870.95$782.95Save $88.00
FlowmasterFlowmaster Crossmember-Back Exhaust System Fits 1964-1972 GM A-Body with V8 engine. 2.50 inch pipes and hangers only. - Mufflers sold separatelyAdvertised Price $562.95$505.95Save $57.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1964-1966 Mustang, 2.50-inch stainless steel system. - Aggressive to moderate soundAdvertised Price $1,177.95$1,059.95Save $118.00
FlowmasterFlowmaster Crossmember-Back Exhaust System Fits 1959-1964 Impala, Biscayne, Bel Air with V8 engine. - Moderate to mild soundAdvertised Price $699.95$628.95Save $71.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1972 Chevrolet/GMC K10, K15/K1500, K20, K25/K2500 4WD Trucks with V8 Engines, 2.50" 409 Stainless SteelAdvertised Price $999.95$898.95Save $101.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1964-1967 GM A-Body 3.00-inch stainless steel system with V8 engine. - Aggressive soundAdvertised Price $1,229.95$1,105.95Save $124.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1974 Chevrolet Camaro, Pontiac Firebird with V8 engine. 2.50 inch Stainless Steel - Moderate soundAdvertised Price $1,177.95$1,059.95Save $118.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Body, 3.00 inch Aluminized Steel -Advertised Price $1,075.95$967.95Save $108.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1968-1974 Chevrolet Nova with V8 engine. 2.50 inch Stainless Steel Pipes - Aggressive to moderate soundAdvertised Price $921.95$828.95Save $93.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1970 Ford Mustang with V8 engine and headers. Aluminized Steel. - Aggressive to moderate soundAdvertised Price $870.95$782.95Save $88.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1962-1967 Chevrolet Chevy II/Nova with V8 engine. 2.50 inch Stainless Steel - Aggressive to moderate soundAdvertised Price $1,177.95$1,059.95Save $118.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1970 Ford Mustang with V8 engine. Stainless Steel. - Aggressive to moderate soundAdvertised Price $972.95$874.95Save $98.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1969 Chevrolet Camaro & Pontiac Firebird with V8 engine. 2.50 inch Stainless Steel - Aggressive to moderate soundAdvertised Price $1,024.95$921.95Save $103.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1963-1966 GM C10/1000 Series V8 Truck, 2WD Short and Long Bed, 2.5" 409 Stainless Steel, Dual ExitAdvertised Price $921.95$828.95Save $93.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1972 Chevrolet/GMC C10, C15 1/2 Ton trucks with V8 engine. - Aggressive to moderate soundAdvertised Price $870.95$782.95Save $88.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Body with a V8 engine. 3.0 inch Stainless Steel - Aggressive soundAdvertised Price $1,259.95$1,132.95Save $127.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System 1968-1970 Mopar B-Body with V8 engine, 3.0" - Aggressive soundAdvertised Price $1,177.95$1,059.95Save $118.00
FlowmasterFlowmaster Force II Crossmember-Back Exhaust System Fits 1970-1973 Corvette Stingray with 350 Small Block Engine. - Moderate soundAdvertised Price $1,229.95$1,105.95Save $124.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System 1955-1957 Chevrolet cars with V8 engine. - Aggressive to moderate soundAdvertised Price $1,177.95$1,059.95Save $118.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System 1967-1970 Ford Mustang with V8 engine, 2.5" pipes - Aggressive soundAdvertised Price $799.95$718.95Save $81.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies with V8 engine. 2.50-inch Stainless Steel Pipes. - Aggressive soundAdvertised Price $1,075.95$967.95Save $108.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System 1965-1968 Chevrolet Impala, Caprice coupes, wagons and convertibles with a V8 engine. - Aggressive to moderate soundAdvertised Price $1,024.95$921.95Save $103.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System 1968-1970 Mopar B-bodies with V8 engine, 2.5" Stainless Steel - Aggressive to moderate soundAdvertised Price $1,075.95$967.95Save $108.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1972 Ford F-100/250/350 V8 With Side Tank, 2WD Long Bed Only, 2.5" 409 Stainless Steel, Dual ExitAdvertised Price $767.95$690.95Save $77.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1968 Camaro and Firebird with V8 engine. 2.50 inch Stainless Steel - Aggressive to moderate soundAdvertised Price $972.95$874.95Save $98.00
FlowmasterFlowmaster Force II Crossmember-Back Exhaust System Fits 1968-1969 Chevrolet Corvette Stingray with V8 engines. - Moderate sound$1,229.95
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System 1967-1970 Ford Mustang with V8 engine, 2.5" 409 Stainless Steel Pipes - Aggressive to moderate soundAdvertised Price $1,024.95$921.95Save $103.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1964-1966 Ford Mustang with a V8 engine, 2.5" Aluminized Pipes - Aggressive to moderate soundAdvertised Price $972.95$874.95Save $98.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1974 Chevrolet Camaro, Pontiac Firebird and 1968-1974 Chevrolet Nova with V8 engine, 2.5" pipes - Moderate soundAdvertised Price $921.95$828.95Save $93.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1964-1972 Chevrolet El Camino and GMC Sprint with V8 engine, 2.5" Aluminized pipes - Aggressive to moderate soundAdvertised Price $999.95$898.95Save $101.00
FlowmasterFlowmaster Crossmember-Back Exhaust System Fits 1967-1969 Camaro and Firebird with V8 engine. 3.00-inch Aluminized pipes.Advertised Price $599.95$538.95Save $61.00
FlowmasterFlowmaster Crossmember-Back Exhaust System Fits 1964-1967 GM A-Bodies, 3.0 inch aluminized pipe kitAdvertised Price $562.95$505.95Save $57.00
FlowmasterFlowmaster Crossmember-Back Exhaust System Fits 1968-1972 GM A-body cars with V8 engine. 3-Inch Aluminized Pipe Only Exhaust KitAdvertised Price $562.95$505.95Save $57.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1969 Chevrolet Camaro and Pontiac Firebird with V8 engine, 2.5" Aluminized Pipes - Aggressive to moderate soundAdvertised Price $870.95$782.95Save $88.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1970-1974 Chevrolet Camaro and Pontiac Firebird with V8 engine. 2.50 inch Aluminized Steel - Aggressive to moderate soundAdvertised Price $921.95$828.95Save $93.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1964-1967 GM A-Body with a V8 engine. 3.0" aluminized pipes - Aggressive soundAdvertised Price $1,075.95$967.95Save $108.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System 1966-1967 Ford Fairlane with V8 engine. 2.50 inch Aluminized Steel - Moderate soundAdvertised Price $972.95$874.95Save $98.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1973-1974 Chevrolet and GMC C10, C20 2wd with V8 engines.Advertised Price $1,024.95$921.95Save $103.00
FlowmasterFlowmaster American Thunder Crossmember-Back Exhaust System Fits 1967-1974 Mopar A-Body cars with V8 engine. - Aggressive to moderate soundAdvertised Price $1,229.95$1,105.95Save $124.00
FlowmasterFlowmaster Force II Crossmember-Back Exhaust System 1974-1979 Chevrolet Corvette 350ci engine. (Intended for Off Road Use Only on 1975-1979 Vehicles). - Moderate to mild soundAdvertised Price $1,349.95$1,213.95Save $136.00
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Classic Exhaust Systems
Classic exhaust systems designed specifically for vintage and classic vehicles, delivering period-correct sound with modern performance improvements. Engineered to maintain proper fitment while enhancing exhaust flow and durability over original systems.












































