Flowmaster 68-72 GM A-BODY 2.5in. American Thunder SS Exhaust System

This American Thunder® exhaust system comes as a complete true dual Crossmember-Back exhaust for your 1968-1972 GM A-body with a V8 engine. These dual exhaust systems feature 2.50-inch mandrel-bent stainless steel tubing for maximum performance, includes a built-in H-pipe/balance tube flowing into a pair of large case Super 40® mufflers that deliver an aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. The 2.50-inch tailpipes exit at a slight angle down under the rear bumper for a strong muscular look. The system includes all hangers and necessary hardware for installation. Like all Flowmaster® systems, the benefits include improved throttle response, power and mileage and is covered by our Lifetime Limited Warranty. Fits 1968-1972 GM A-Bodies with V8 engine. 2.50-inch Stainless Steel Pipes. - Aggressive sound Fits 1968-1972 GM A-Bodies with V8 engine.

• Does Not Include Header Reducers or Downpipes for Factory Manifolds
• H-pipe Crossover for Maximum Power and Deep Tone
• Super 40 Series Mufflers for Deep Powerful Sound
• Includes Hangers and Hardware for Installation
• Mandrel-bent 16-gauge Stainless Steel Tubing
• Crossmember-Back True Dual Exhaust System
• Aggressive Exterior Exhaust Tone
• Lifetime Limited Warranty

Upgrade your classic GM A-Body with the Flowmaster 817409 American Thunder exhaust system, a complete crossmember-back true dual exhaust designed for 1968-1972 Buick, Pontiac, and other GM A-Body vehicles equipped with a V8 engine. The system uses 2.5-inch mandrel-bent stainless steel tubing to support smooth exhaust flow, improved throttle response, and strong performance. Its stainless steel construction provides durable service for street-driven muscle cars and restoration projects.
A built-in H-pipe crossover helps balance exhaust pulses while contributing to a deep, powerful tone. The included Super 40 Series mufflers produce an aggressive sound inside and outside the vehicle, making this system well suited for enthusiasts who want their performance-oriented exhaust note to be heard. Tailpipes exit at a slight angle beneath the rear bumper for a clean, muscular appearance.
The Flowmaster 817409 system includes the required hangers and installation hardware for a complete crossmember-back installation. It is designed for use with compatible headers or exhaust components and does not include header reducers or downpipes for factory manifolds. Professional installation may be recommended to verify fitment and ensure proper alignment. This product is covered by Flowmaster's Lifetime Limited Warranty. It is not emissions certified for use on pollution-controlled vehicles, and applicable emissions requirements should be confirmed before installation.

Features:

• Application: Fits 1968-1972 GM A-Body vehicles equipped with a V8 engine

• System Design: Complete crossmember-back true dual exhaust system

• Tubing: 2.5-inch mandrel-bent 16-gauge stainless steel tubing

• Crossover: Built-in H-pipe crossover for improved exhaust balance, power potential, and deep tone

• Mufflers: Super 40 Series mufflers deliver a deep, powerful, aggressive exhaust sound

• Tailpipes: Exit at a slight angle beneath the rear bumper for a muscular appearance

• Installation: Includes hangers and necessary installation hardware

• Compatibility: Does not include header reducers or downpipes for factory manifolds

• Warranty: Covered by Flowmaster's Lifetime Limited Warranty

• Emissions: Not emissions certified for pollution-controlled vehicle applications

Fitment:
Buick GS Base 1970
Buick GS Base 1971
Buick GS Base 1972
Buick GS 350 Base 1968
Buick GS 350 Base 1969
Buick GS 400 Base 1968
Buick GS 400 Base 1969
Buick GS 455 Base 1970
Buick GS 455 Base 1971
Buick GS 455 Base 1972
Buick GS 455 GSX 1970
Buick Skylark 350 1970
Buick Skylark 350 1972
Buick Skylark Base 1968
Buick Skylark Base 1969
Buick Skylark Base 1970
Buick Skylark Base 1971
Buick Skylark Base 1972
Buick Skylark Custom 1968
Buick Skylark Custom 1969
Buick Skylark Custom 1970
Buick Skylark Custom 1971
Buick Skylark Custom 1972
Buick Special Base 1968
Buick Special Base 1969
Buick Sportwagon Base 1968
Buick Sportwagon Base 1969
Buick Sportwagon Custom 1968
Buick Sportwagon Custom 1969
Chevrolet Chevelle 300 1968
Chevrolet Chevelle 300 Deluxe 1968
Chevrolet Chevelle 300 Deluxe 1969
Chevrolet Chevelle Base 1970
Chevrolet Chevelle Base 1971
Chevrolet Chevelle Base 1972
Chevrolet Chevelle Concours 1968
Chevrolet Chevelle Concours 1969
Chevrolet Chevelle Concours 1970
Chevrolet Chevelle Concours 1971
Chevrolet Chevelle Concours 1972
Chevrolet Chevelle Concours Estate 1969
Chevrolet Chevelle Concours Estate 1970
Chevrolet Chevelle Concours Estate 1971
Chevrolet Chevelle Concours Estate 1972
Chevrolet Chevelle Greenbrier 1969
Chevrolet Chevelle Greenbrier 1970
Chevrolet Chevelle Greenbrier 1971
Chevrolet Chevelle Greenbrier 1972
Chevrolet Chevelle Malibu 1968
Chevrolet Chevelle Malibu 1969
Chevrolet Chevelle Malibu 1970
Chevrolet Chevelle Malibu 1971
Chevrolet Chevelle Malibu 1972
Chevrolet Chevelle Nomad 1968
Chevrolet Chevelle Nomad 1969
Chevrolet Chevelle Nomad 1970
Chevrolet Chevelle Nomad 1971
Chevrolet Chevelle Nomad 1972
Chevrolet Chevelle SS 1971
Chevrolet Chevelle SS 1972
Chevrolet El Camino Base 1968
Chevrolet El Camino Base 1969
Chevrolet El Camino Base 1970
Chevrolet El Camino Base 1971
Chevrolet El Camino Base 1972
Chevrolet El Camino Custom 1968
Chevrolet El Camino Custom 1969
Chevrolet El Camino Custom 1970
Chevrolet El Camino Custom 1971
Chevrolet El Camino Custom 1972
Chevrolet El Camino SS 1968
Chevrolet El Camino SS 1969
Chevrolet El Camino SS 1970
Chevrolet El Camino SS 1971
Chevrolet El Camino SS 1972
Chevrolet Monte Carlo Base 1970
Chevrolet Monte Carlo Base 1971
Chevrolet Monte Carlo Base 1972
GMC Sprint Base 1971
GMC Sprint Base 1972
GMC Sprint Custom 1972
Oldsmobile 442 Base 1968
Oldsmobile 442 Base 1969
Oldsmobile 442 Base 1970
Oldsmobile 442 Base 1971
Oldsmobile Cutlass Base 1968
Oldsmobile Cutlass Base 1969
Oldsmobile Cutlass Base 1970
Oldsmobile Cutlass Base 1971
Oldsmobile Cutlass Base 1972
Oldsmobile Cutlass Cruiser 1972
Oldsmobile Cutlass S 1968
Oldsmobile Cutlass S 1971
Oldsmobile Cutlass S 1972
Oldsmobile Cutlass Supreme Base 1968
Oldsmobile Cutlass Supreme Base 1969
Oldsmobile Cutlass Supreme Base 1970
Oldsmobile Cutlass Supreme Base 1971
Oldsmobile Cutlass Supreme Base 1972
Oldsmobile F85 Base 1968
Oldsmobile F85 Base 1969
Oldsmobile F85 Base 1970
Oldsmobile F85 Base 1971
Oldsmobile F85 Base 1972
Oldsmobile Vista Cruiser Base 1968
Oldsmobile Vista Cruiser Base 1969
Oldsmobile Vista Cruiser Base 1970
Oldsmobile Vista Cruiser Base 1971
Oldsmobile Vista Cruiser Base 1972
Pontiac Grand Prix Base 1968
Pontiac Grand Prix Base 1969
Pontiac Grand Prix Base 1970
Pontiac Grand Prix Base 1971
Pontiac Grand Prix Base 1972
Pontiac GTO Base 1968
Pontiac GTO Base 1969
Pontiac GTO Base 1970
Pontiac GTO Base 1971
Pontiac GTO Base 1972
Pontiac GTO The Judge 1970
Pontiac GTO The Judge 1971
Pontiac LeMans Base 1968
Pontiac LeMans Base 1969
Pontiac LeMans Base 1970
Pontiac LeMans Base 1971
Pontiac LeMans Base 1972
Pontiac LeMans Luxury 1972
Pontiac LeMans Safari 1969
Pontiac LeMans Safari 1970
Pontiac LeMans Sport 1970
Pontiac LeMans Sport 1971
Pontiac LeMans Sport 1972
Pontiac LeMans T37 1971
Pontiac Tempest Base 1968
Pontiac Tempest Base 1969
Pontiac Tempest Base 1970
Pontiac Tempest Custom 1968
Pontiac Tempest Custom 1969
Pontiac Tempest GT 1970
Pontiac Tempest Safari 1968
Pontiac Tempest Safari 1969