Flowmaster American Thunder Dual Rear-Exit Cat-Back Exhaust For F-150 (2021-2025) - 818169
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Flowmaster American Thunder Exhaust System
Built to howl. Tuned to win. The Flowmaster® American Thunder Cat-Back (PN 818169) brings classic Flowmaster authority with daily-drive manners. It’s a mandrel-bent 409S stainless system feeding a Super 40 Series muffler and finishing in dual 4.5" ceramic-black tips that fill the bumper cutouts the way Ford should’ve.
Why it hits
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Real gains: Dyno showed +18 hp / +14 lb-ft at the wheels vs. stock (max increases).
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Free-flowing 3" tubing: Mandrel-bent 16-gauge 409 stainless for flow and durability.
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Super 40 voice: Deep, aggressive-to-moderate tone with head-turn on throttle, calm on cruise.
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Factory-clean fit: Uses OEM hanger locations, includes hardware/hangers—no welding required.
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Proper finish: Dual 4.5" rolled, single-wall, angle-cut tips in ceramic black stainless—fills the cutouts better than OEM.
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Backed by Flowmaster: Limited Lifetime Warranty on stainless components.
What it fits
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Ford F-150 with factory dual-exhaust bumper cutouts—works with PowerBoost and standard gas trucks (select your year/engine/wheelbase on the product page for exact part mapping).
Sound
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Idle/Cruise: Deep muscle, controlled cabin presence.
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Wide-Open Throttle: Classic American Thunder bark—authoritative without being obnoxious.
Install notes
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Type: Cat-Back, single in / dual out, dual rear exit (driver & passenger)
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Driveway friendly: ~2 hours, hand tools, no welding
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Keep all packaging until you’ve verified fitment. Photograph your unbox/install for records and support.
Tech specs
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Material: 409S stainless steel (16-ga)
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Primary pipe diameter: 3.0" mandrel-bent
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Muffler: Super 40 Series, single inlet / dual outlet (qty 1)
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Exhaust type: Single system with dual rear exits
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Tips: (2) 4.5" round, rolled, single-wall, angle-cut, ceramic-black stainless
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Includes: Muffler, pipes, tips, hardware, factory-style hangers, instructions
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Muffler delete: No
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Required welding: No
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Estimated install time: 2 hours
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Sound level: Aggressive / Moderate
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Warranty: Limited Lifetime (manufacturer)
Builder’s checklist
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Confirm year/engine/drive/bed & wheelbase and factory dual-exit bumper before ordering.
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Test-fit from front to rear before tightening clamps.
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Re-torque after heat cycles.
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Pair with intake/tune for best net gains.
Fitment questions? Shoot us a line! We’ll sanity-check your build before you buy.
Prop 65 WARNING: While this product is safe unaltered, welding can expose chemicals in this product that can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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