Description
Overview
The Flowmaster American Thunder Cat-Back Exhaust System is engineered to unlock deeper sound and stronger performance from the 2021-2026 Ford F-150 equipped with the 2.7L, 3.5L, or 5.0L engine. Built around Flowmaster’s proven Super 40 Series muffler, this cat-back system delivers a deep, powerful exhaust note while improving flow over the factory setup — a purposeful upgrade for truck owners who want their F-150 to look and sound as capable as it drives.
At the heart of the system is mandrel-bent 409 stainless steel tubing, chosen for maximum exhaust flow and long-term durability. The 3.0-inch inlet pipe feeds into dual 2.5-inch tailpipes, and on the dyno the American Thunder system produces maximum gains of 11 HP and 10 LB.-FT. at the rear wheels. The Super 40 Series muffler brings an aggressive-to-moderate tone that adds attitude without being overbearing.
Key Benefits
Every component is designed to bolt into place using the factory hanger and mounting locations, so installation is straightforward and requires no cutting or fabrication. All necessary hardware is included in the kit, and the system is finished with 3.5-inch polished stainless steel tips featuring an embossed Flowmaster logo for a classic performance look.
- Super 40 Series muffler (16.50-inch overall length, center inlet, dual 2.50-inch outlets) for a deep, powerful sound
- Mandrel-bent 409 stainless steel tubing for maximum flow and durability
- 3.0-inch inlet pipe with dual 2.5-inch tailpipes
- Choice of side-exit or rear-exit configurations to customize the look
- 3.5-inch polished stainless steel tips with embossed logo
- Maximum dyno gains of 11 HP and 10 LB.-FT. at the rear wheels
Choose Your Exit Style
The American Thunder system offers both side-exit and rear-exit options, letting you tailor the appearance and stance of your F-150 to your taste. Whether you prefer the aggressive presence of side exits or the clean look of a rear exit, the polished tips and dual-tailpipe layout finish the truck with a factory-plus-performance stance.
Fitment
This cat-back system is designed for the 2021-2026 Ford F-150 with the 2.7L, 3.5L, and 5.0L engines. It reuses the factory hanger locations for a direct-fit installation, and the system is CARB (California) compliant with Emission Code 5. Please note the California Proposition 65 warning applies.
Backed by Flowmaster’s Lifetime Limited Warranty, the American Thunder cat-back combines the durability of 409 stainless steel, the signature Super 40 sound, and real dyno-proven gains — a complete, hardware-included upgrade for owners who want more sound, more flow, and a sharper look from their F-150.
