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Supplier details checked 2026-09-23 · Test catalog
1998-2003 Ford F-150 with 4.6L or 5.4L engine. Fits both 2/4-wheel drive models. - Aggressive sound
Flowmaster American Thunder Cat-back Exhaust System
Large 3.50-inch Polished 304 Stainless Steel Tips
Dual Outlet Super 40 Series Performance Muffler
Mandrel-bent Stainless Steel Construction
Multiple Exit Styles Provided in Kit
Aggressive Exterior Performance Tone
Uses the Factory Hanger Locations
Clears the Factory Spare Tire
Lifetime Limited Warranty
Moderate Interior Tone
Easy Installation
Fits 1998-2003 Ford F-150 with 4.6L or 5.4L engine. Fits both 2/4-wheel drive models.
Flowmaster 98-03 Ford F150 American Thunder SS Cat-Back Exhaust System
9803 FORD F150 ALL AMT DORS 409S
SYS 98-03 FORD F150
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.
SYS 98-03 FO
