Flowmaster American Thunder Axle-Back Exhaust Kit, 21-25 Ford Bronco 818121 SKU: 6G-8011

Flowmaster American Thunder Axle-Back Exhaust Kit | 2021–25 Ford Bronco

If you’re ready to let your Bronco breathe and growl like it should, the Flowmaster American Thunder Axle-Back Exhaust Kit is the upgrade you’ve been waiting for. Designed to fit the 2021–25 Ford Bronco with either the 2.3L or 2.7L engine, this system brings Flowmaster's legendary performance and sound to your 6th Gen rig.

Using 3-inch mandrel-bent 409 stainless steel tubing and a 60 Series performance muffler, this axle-back system delivers a deep, aggressive-to-moderate tone without the annoying drone. It’s a bolt-on kit that uses factory hanger locations and includes everything you need to install. On the dyno, you can expect gains of up to 19 horsepower and 19 lb-ft of torque at the wheels—a solid performance bump with a sound to match.

• High-Flow 409 Stainless Tubing – 3.00-inch mandrel-bent stainless steel for maximum flow and long-term durability

• Performance Muffler Included – 60 Series Delta Flow muffler delivers a deep tone with reduced cabin drone

• Polished Stainless Steel Tip – 3.00-inch polished tip adds a clean, custom look at the tail

• Dyno-Proven Gains – Up to 19 HP and 19 lb-ft torque at the rear wheels

• Bolt-On Install – Uses stock hanger locations with included hardware for a quick, clean install

Give your Bronco the voice it deserves - this Flowmaster Axle-Back Exhaust Kit delivers a deep tone and dyno-proven power with stainless steel style to match.