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Flowmaster American Thunder Crossmember-Back Exhaust System

1967-1972 Ford F-100/250/350 V8 Without Side Tank, 2WD Short and Long Bed, 2.5" 409 Stainless Steel, Dual Exit

Part # 817938
Estimated shipping date: 04/04/2022
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This American Thunder exhaust system is specifically designed for 1967-1972 Ford F-100/F-250/F-350 2-wheel drive V8 trucks without a side mounted auxiliary fuel tank. The system is perfect for the person looking for an aggressive to moderate exterior and interior sound level. Starting just after a set of factory manifolds or headers, this exhaust system comes complete with a built-in H-pipe crossover and all mandrel bent 2.50-inch 409 stainless steel tubing that helps maximize the flow of the exhaust pulses for better performance and the added durability of stainless steel. The Super 44 Series performance mufflers will give any V8 a deep rumble with that classic Flowmaster tone. This system comes with your choice of three tailpipe exits, straight out the rear, side exit behind each rear tire, or dumped behind the rear tires. The system includes all hardware necessary for an at home installation. This exhaust system is covered by our Lifetime Limited Warranty. Fits both short and long wheelbase trucks.


  • 3 Exit Options Allow You to Customize the Look of Your Truck
  • 2.5-Inch Mandrel Bent Tubing Improves Exhaust Flow for Better Performance
  • Super 44 Series Mufflers Give You a Deep, Classic Muscle Truck Sound
  • H-Pipe Style Crossover Pipe Improves Performance and Reduces Interior Sound
  • Includes all Necessary Hangers and Hardware for an at Home Installation
  • 409 Stainless Steel adds Corrosion Resistance and Durability
  • Backed by Flowmaster’s Lifetime Limited Warranty

About Flowmaster

Flowmaster® is a household name, and for good reason. They've built legendary exhaust systems and mufflers for decades, and now offer performance air intakes, catalytic converters, and headers to give your hot rod performance to match the iconic Flowmaster sound.

Brand Flowmaster
Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionDual Out Rear / Dual Out Side
Material409 Stainless Steel
Mount TypeUses New Hangers (Included)
Muffler Body Length (in)13.25
Muffler ColorBlack
Muffler FinishPainted
Muffler Inlet Diameter (in)2.5
Muffler Inlet LocationOffset
Muffler Material409S Stainless Steel
Muffler Outlet Diameter (in)2.5
Muffler Outlet LocationCenter
Muffler Overall Length (in)19.5
Muffler Part NumberKit Only
Muffler Quantity2
Muffler SeriesSuper 44
Muffler ShapeOval
Muffler TypeReflection
Product TypeExhaust System
Single DualDual
Sound LevelAggressive / Moderate
System TypeCrossmember-back
Tip StyleNot Included
Tubing Diameter (in)2.5
Tubing Material409S Stainless Steel
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817938

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Fits Both Long And Short Wheelbases Does Not Fit Trucks with Side Mounted Auxiliary Fuel Tanks. Connector Pipes Not Included

*Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

Some parts are not legal for use in California or other states with similar regulations.