American Thunder Crossmember-Back Exhaust System — 1967–1972 Ford F-100/F-250 2WD Long Bed
American Thunder Crossmember-Back Exhaust System — 1967–1972 Ford F-100/F-250 2WD Long Bed
American Thunder Crossmember-Back Exhaust System — 1967–1972 Ford F-100/F-250 2WD Long Bed
American Thunder Crossmember-Back Exhaust System — 1967–1972 Ford F-100/F-250 2WD Long Bed
American Thunder Crossmember-Back Exhaust System — 1967–1972 Ford F-100/F-250 2WD Long Bed
American Thunder Crossmember-Back Exhaust System — 1967–1972 Ford F-100/F-250 2WD Long Bed
American Thunder Crossmember-Back Exhaust System — 1967–1972 Ford F-100/F-250 2WD Long Bed
American Thunder Crossmember-Back Exhaust System — 1967–1972 Ford F-100/F-250 2WD Long Bed
American Thunder Crossmember-Back Exhaust System — 1967–1972 Ford F-100/F-250 2WD Long Bed

American Thunder Crossmember-Back Exhaust System — 1967–1972 Ford F-100/F-250 2WD Long Bed

$799.95

American Thunder crossmember-back exhaust for 1967–72 Ford F-100, F-250 and F-350 2WD long bed V8 trucks. 2.50 inch mandrel-bent 409 stainless with Super 44 mufflers.

  • Full diameter through the bends - mandrel-bent 2.50 inch tubing instead of crushed turns.
  • 409 stainless - survives the salt and heat cycles that kill mild steel.
  • Super 44 tone - deep rumble; classic Flowmaster sound.
  • Your exit; your call - straight rear; behind the tires; or dumped.
  • Everything in the box - H-pipe; mufflers; hangers; clamps and brackets.
  • Lifetime Limited Warranty - behind the whole system.

Install Level: Moderate

Long bed only, and requires a side-mounted fuel tank.
Tips, gaskets, converters and connector pipes not included.

SKU: 817934

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WARNING: Handling passenger or off-highway motor vehicle parts can expose you to chemicals such as phthalates and lead. Learn more.
American Thunder Crossmember-Back Exhaust System — 1967–1972 Ford F-100/F-250 2WD Long Bed
$799.95

Finish the Build Right

Parts our crew pairs with this kit so your swap goes together right the first time.

1–2 of 4
  • FFG 1967-72 Ford Connector Kit $693.99 Details for FFG 1967-72 Ford Connector Kit
  • Hooker Competition Long Tube Headers, Painted — 1969–1974 Ford F-100/F-150 2WD, 255–302W $399.95 Details for Hooker Competition Long Tube Headers, Painted — 1969–1974 Ford F-100/F-150 2WD, 255–302W
  • Flowtech Long Tube Headers, Ceramic Coated — 1969–1974 Ford F-100 2WD, 302 Windsor $584.95 Details for Flowtech Long Tube Headers, Ceramic Coated — 1969–1974 Ford F-100 2WD, 302 Windsor
  • 1967–72 F100 Coyote Swap Mount Kit | 2WD $675.00 Details for 1967–72 F100 Coyote Swap Mount Kit | 2WD

Overview
Specifications
Tech Resources
Compatibility

Give it a voice. Put stainless underneath it.

A complete crossmember-back system for 1967–1972 Ford F-100 and F-250 2WD long bed V8 trucks with a side tank — 2.50-inch mandrel-bent 409 stainless, Super 44 mufflers, and every hanger and clamp needed to install it at home.

Factory exhaust on these trucks was built quiet and cheap. This one was built to flow. It picks up behind your manifolds or headers and runs 2.50-inch mandrel-bent tubing all the way back, holding full diameter through every bend instead of getting crushed in the turns.

Every piece you need is in the box — tubing, built-in H-pipe crossover, two Super 44 mufflers, hangers, flat band clamps, and brackets. Flowmaster built it for an at-home install, and you pick the exit: straight out the rear, side exit behind each rear tire, or dumped behind the tires.

409 stainless is why this system stays under your truck. Salt and heat cycles are what kill mild steel. Deep rumble, classic Flowmaster tone, and a Lifetime Limited Warranty behind it.

What's In the Kit

Everything needed to run stainless from the crossmember back:

  • Mandrel-Bent 409 Stainless Tubing — 2.50", with Built-In H-Pipe Crossover
  • x2 Super 44 Chambered Mufflers — 13.25" x 9.50" x 4.00", Black High-Temp Paint
  • x2 Tail Pipes — 2.50" Outlet, Three Exit Options
  • Hangers, Flat Band Clamps, and Mounting Brackets
  • Not included: tips, gaskets, converters, or connector pipes
  • Fits: 1967–1972 Ford F-100 / F-250 V8, 2WD Long Bed Only, Side-Mounted Tank.
  • Material: 409 Stainless Steel. Sound Level: Aggressive / Moderate.
  • Emissions: Code 5 — legal on emissions-controlled, uncontrolled, and racing vehicles. CARB compliant. Prop 65: chromium, nickel.
  • Warranty: Flowmaster Lifetime Limited.
Flowmaster part number 817934
Material: 409 stainless steel; mandrel-bent
Tubing diameter: 2.50 inch
Built-in H-pipe crossover
Mufflers: 2 x Super 44 chambered - 13.25 in x 9.50 in x 4.00 in; black high-temp paint
Tail pipes: 2 x 2.50 inch outlet; three exit options
Includes: hangers; flat band clamps; mounting brackets
Crossmember-back system - picks up behind manifolds or headers
Lifetime Limited Warranty
Not included: tips; gaskets; converters; connector pipes

Questions? Talk to the FFG Team

For fitment questions or build-specific guidance, the FFG team has you covered.

Email: info@fatfender.com

Call: (480) 621-6072

1967-1972 Ford F-100; F-250; F-350 - V8; 2WD; long bed only; side-mounted tank.
Installs from the crossmember back - works with factory manifolds or headers.
Does not fit short bed; 4WD; or trucks without a side-mounted tank.

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