Flowmaster American Thunder Header-Back Exhaust System

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  • Dual exhaust system
  • Mandrel bent tubing
  • Tested and proven dyno tune
  • Full bolt-on fitment
  • Made with tough steel
  • Made in the USA

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    100% Guaranteed to Fit

    In the highly unlikely event of a fitment problem, we’ll return your purchase at no cost to you. We pay return shipping on all orders, so it won’t cost you a penny to send back a defective part.


    • Excellent performance exhaust system with mild interior tone and aggressive exterior tone
    • Mandrel bent tubing for easy and unrestricted air flow
    • Tested and proven dyno tune for excellent performance
    • Choose between stainless steel and aluminized steel
    • Easy no-drill installation for most models
    • Made with tough steel to stay strong and last long
    • Manufacturer's guarantee of superior crafting and excellent quality
    • Made in the USA in an economy-building industry

    Heavy-duty exhaust system

    The Flowmaster American Thunder header-back is a complete dual exhaust system. It gives your vehicle a smooth exhaust flow with an aggressive exterior tone. It is designed to perform and give you the ultimate driving experience.

    Unrestricted air flow

    It features a mandrel-bent tubing that allows easy and unrestricted airflow. This ensures a smooth exhaust flow, reduced internal resonance and a mild interior tone for an enjoyable driving experience.

    Unmatched performance

    The system is dyno tuned for optimal performance with reduced flow restrictions and internal resonance. This means that you get the best out of it without sacrificing a quiet and enjoyable drive.

    Stainless steel or aluminized steel

    The Flowmaster American Thunder header-back exhaust system is available in stainless steel and aluminized steel.

    Full bolt-on fitment

    The exhaust system comes with a full bolt-on fitment with factory mounting points for an easy installation. It also comes with all installation hardware and a detailed manual. For the best fitment, let a professional do the installation.

    Made strong to last long

    The components are made with tough steel. Expert engineers weld and process them with advanced technology to make sure that you get the value for your money. The exhaust system is virtually indestructible.

    Manufacturer's guarantee of quality

    Flowmaster provides a limited lifetime warranty for every purchase of the stainless steel exhaust system. The aluminized steel system comes with a three-year warranty. It is an assurance of superior quality and excellent performance.

    Proudly made in the USA

    The Flowmaster American Thunder header back exhaust system is proudly made in the USA with local labor and materials. The company employs thousands of American professionals every year and makes its contribution to the growth of the economy.

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    Lifetime Limited Warranty applies to Flowmaster all stainless steel exhaust systems.

    Three (3) Year Limited Warranty applies to Flowmaster aluminized steel exhaust systems.

    Part Numbers

    The following part numbers are available in this product line:


    To purchase this product for your vehicle, please select the Year, Make and Model of your vehicle at the top of this page.

    Buick (1964-1974)

    Apollo, Gran Sport, GS, GS 350, GS 400, GS 455, Skylark, Special

    Chevrolet (1955-1988)

    Bel Air, C10 Pickup, C20, C20 Pickup, Camaro, Chevelle, Chevy II, El Camino, Malibu, Monte Carlo, Nova, One-Fifty Series, R20, Two-Ten Series

    Dodge (1968-1974)

    Charger, Coronet, Dart

    Ford (1964-1970)

    Fairlane, Mustang

    GMC (1967-1986)

    C15/C1500 Pickup, C25, C25/C2500 Pickup, C2500, Sprint

    Oldsmobile (1964-1974)

    442, Cutlass, Cutlass Supreme, F85, Omega, Vista Cruiser

    Plymouth (1967-1974)

    Belvedere, Duster, GTX, Road Runner, Satellite, Scamp, Valiant

    Pontiac (1963-1974)

    Firebird, Grand Prix, GTO, LeMans, Tempest, Ventura