Description
Overview
The Flowmaster American Thunder Axle-Back Exhaust System is engineered for drivers who want the ideal balance between a refined, mild tone while cruising and at idle and an aggressive, purposeful growl when you get into the throttle — all with no interior drone. Purpose-built for the daily driven 2021-2026 Ford Bronco equipped with the 2.3 or 2.7-liter engine, this system transforms the factory sound and performance while keeping installation straightforward.
At the heart of the system is a tuned 60 Series style muffler, the key to its aggressive-to-moderate exhaust character. This muffler delivers the deep, throaty note Flowmaster is known for and helps free up power, with maximum dyno gains of 19 hp and 19 lb-ft measured at the rear wheels. The black muffler measures 34.00 inches in overall length, features a center inlet with an offset 3.00-inch outlet, and is included as part of the complete kit.
Construction & Performance
Flow and durability come from 3.00-inch mandrel-bent 409 stainless steel tubing, which maintains a smooth, consistent bore through every bend to maximize exhaust flow and stand up to years of driving. A polished 3.00-inch stainless steel tip with an embossed logo adds a custom, finished look that complements the iconic styling of the Bronco. The system carries an aggressive-to-moderate sound level, striking that sought-after sweet spot between everyday manners and weekend attitude.
Key Highlights
- Axle-back design with a tuned 60 Series style muffler for an aggressive yet drone-free tone
- Maximum dyno gains of 19 hp and 19 lb-ft at the rear wheels
- 3.00-inch mandrel-bent 409 stainless steel tubing for optimized flow and durability
- Polished 3.00-inch stainless steel tip with embossed logo for a custom appearance
- Single tail pipe, black muffler, and silver pipe finish
- CARB (California) compliant — Emission Code 5
Easy, Bolt-On Installation
This is a true bolt-on upgrade. All of the necessary hardware is included, and the system uses new hangers (also included) along with factory mounting locations for a clean, hassle-free installation. Whether you’re doing the work in your own garage or having it installed, the American Thunder system is designed to go on without cutting or guesswork.
Fitment
Designed specifically for the 2021-2026 Ford Bronco with the 2.3-liter or 2.7-liter engine. As a CARB-compliant system (Emission Code 5), it’s built to meet emissions requirements, making it a smart choice for daily drivers in states with stricter standards. Please note the California Proposition 65 warning applies.
Backed by Flowmaster’s Lifetime Limited Warranty, the American Thunder axle-back system pairs the trusted Flowmaster reputation with proven performance gains, premium stainless construction, and the signature sound Bronco owners want.
