American Thunder Crossmember-Back Exhaust System — 1967–1972 Ford F-100/F-250/F-350 2WD Long Bed
Give it a voice. Put stainless underneath it. 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. 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.
Install Level: Intermediate - full exhaust system install; at-home capable
Built for an at-home install.
Three exit options - straight rear; side exit behind each rear tire; or dumped behind the tires.
Lifetime Limited Warranty.
Not included: tips; gaskets; converters; connector pipes.
Give it a voice. Put stainless underneath it.
A complete crossmember-back system for 1967–1972 Ford F-100, F-250, and F-350 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 / F-350 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.
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
Installs from the crossmember back - works with factory manifolds or headers.
Does not fit short bed; 4WD; or trucks without a side-mounted tank.
