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Manufacturer information. Check the part number and installation requirements for your vehicle.
Supplier details checked 2026-09-23 · Test catalog
2015-2020 Ford F-150 with 2.7L/3.3L/3.5L Ecoboost, 3.5L TiVCT or 5.0L engine.
Flowmaster American Thunder Cat-back Exhaust System
Includes Both Rear and Side Exit Tailpipes
Super 40 Series Performance Muffler
Uses the Factory Hanger Locations
Clears the Factory Spare Tire
Stainless Steel Construction
Lifetime Limited Warranty
Delta Flow Technology
Deep Powerful Sound
Mandrel-bent Tubing
Easy Installation
Does Not Fit Std Cab/Short Bed or Ford Raptor.
Flowmaster 15-20 F150 2.7L/3.5L/5.0L American Thunder SS Cat-Back Exhaust System
1520 F150 27L35L50L AMT DORS 409S
SYS 15-20 F150 2.7L/
Flowmaster's American Thunder Cat-back exhaust system for the 2015-2020 Ford F-150 is perfect for the person looking for an aggressive exterior sound level while maintaining a moderate interior sound with all of the performance benefits that you would expect from Flowmaster. This bolt-on 409S stainless steel system fits all F-150's with the 2.7L/3.3L/3.5L Ecoboost, 3.5L TiVCT and 5.0L engines. Features include a 3.00-inch mandrel-bent inlet tube flowing into a Super 40 series performance muffler with dual 2.50-inch mandrel-bent tailpipes. The finishing touch is the polished 3.50-inch stainless steel tips. The system comes with your choice of final tailpipe exits, either out the rear under the bumper for a muscular, or out the sides behind the rear tires if you tow an RV, boat or trailer. Designed for an easy fit, this system includes all necessary parts, hardware for an easy installation you can do at home. Notes: This system fits all 2/4 WD and all Wheelbases, except Standard Cab/Short Bed.
SYS 15-20 F1
