Flowmaster American Thunder Header-Back Exhaust System

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Fitment Info

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

Our #1 value is customer service.

We believe in doing right by our customers, no matter what it takes.

In keeping with that, we offer a “perfect fit guarantee” that ensures your satisfaction on 3 levels: low price, free shipping, and perfect fitment.

- Alan Marek, Founder of PartCatalog.com

The Lowest Price Anywhere--Guaranteed

At PartCatalog, we’ll beat any competing vendor’s price. And we’re so confident in our rock-bottom prices that we’ll refund the difference if you find a lower price elsewhere.

Free Shipping Both Ways

Our “free shipping both ways” policy means that returns and orders ship free of charge. When you place an order, you pay only the list price and any applicable taxes. We cover the shipping to save you money and ensure timely delivery.

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

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

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

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

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

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

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

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

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:

17104, 17119, 17120, 17129, 17139, 17149, 17200, 17201, 17202, 17289, 17382, 17654, 17742, 817104, 817129, 817139, 817158, 817174, 817200, 817202, 817273, 817281, 817282, 817390, 817409, 817412, 817585, 817654

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

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