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Exhaust Exhaust Pipes, Systems and Components

Flowmaster

American Thunder Cat-Back Exhaust System 1998-2003 Ford F-150 With 4.6L Or 5.4L Engine Fits Both 2/4-Wheel Drive Models Aggressive Sound Flowmaster

$1,153.95 $1,065.95 Save $88.00

SKU: F00L 817663

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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Part #: 817663

Flowmaster's American Thunder cat-back exhaust system for the 1998-2003 Ford F-150 pickup truck is perfect for the person looking for an aggressive exterior sound level with all of the performance benefits that you would expect from Flowmaster. This system allows you the choice of either dual out the rear exit tailpipes, or dual out the sides behind the rear wheels, which is perfect for towing. The bolt-on 409S stainless steel system fits both the 4.6L and the 5.4L V8 engines and features a Super 40 Series performance muffler and dual 2.50-inch mandrel-bent tailpipes finished off with a pair of large 3.50-inch polished stainless steel tips. This system is designed to fit all 2/4 wheel drives, all wheelbases and is covered by our Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.

Features:

  • Large 3.50-inch Polished 304 Stainless Steel Tips
  • Dual Outlet Super 40 Series Performance Muffler
  • Mandrel-bent Stainless Steel Construction
  • Aggressive Exterior Performance Tone
  • Uses the Factory Hanger Locations
  • Multiple Exit Styles Provided in Kit
  • Clears the Factory Spare Tire
  • Lifetime Limited Warranty
  • Moderate Interior Tone
  • Easy Installation

1998-2003 Ford F-150 with 4.6L or 5.4L engine. Fits both 2/4-wheel drive models. - Aggressive sound

This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

MIA's Description

Flowmaster's American Thunder Cat Back exhaust system for the Ford F-150 pickup truck provides an aggressive exterior sound level and performance benefits. This bolt-on 409S stainless steel system fits both 4.6L and 5.4L V8 engines, featuring a Super 40 series performance muffler and dual 2.50-inch mandrel-bent tailpipes, finished with large 3.50-inch polished stainless steel tips. It's designed to fit all 2/4 wheel drives and all wheelbases and includes all necessary parts and hardware for easy installation.

Fitment

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Specifications

BrandFlowmaster
Part NumberF00L 817663

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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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