Description
Overview
The Flowmaster American Thunder Axle-back Exhaust System is engineered specifically for the 2018-2023 Ford Mustang GT coupe and convertible equipped with the 5.0L engine and the Factory Active Performance Exhaust Option. Built around Flowmaster’s proven American Thunder platform, this axle-back kit transforms both the sound and the stance of your Mustang GT while bolting on with factory hangers for a straightforward, do-it-yourself installation at home.
At the heart of the system is a pair of specially designed Outlaw series mufflers from the 60 Series family. These high-flow mufflers deliver a moderately aggressive exterior and interior tone when the factory exhaust valves are closed, then unleash an aggressive, ‘wide open’ exterior sound level the moment you open the valves. It’s the best of both worlds: refined enough for the daily commute and unmistakably loud when you want to make a statement.
Key Benefits
Flowmaster builds this system with large 3.00-inch mandrel-bent 409S stainless steel tubing for optimized high flow, long-term durability, and lasting corrosion resistance. To match the factory Active Performance Exhaust Option, the kit includes a pair of high-quality valves designed to accommodate your Mustang’s OEM exhaust actuators, so you reuse the factory actuators and retain full valve control over your sound. The system is finished with quad 4.00-inch polished 304 stainless steel tips featuring an embossed tip logo, giving your Mustang GT an aggressive look that demands attention every bit as much as the exhaust note.
- Type: Axle-back with dual tail pipes and quad 4.00-inch polished 304 stainless steel tips
- Outlaw 60 Series mufflers included, black finish, 49.50-inch overall length with 3.00-inch dual outlets and side inlet
- 3.00-inch mandrel-bent 409S stainless steel tubing in a silver pipe finish
- Includes a pair of valves to work with the factory exhaust actuators (reuse OEM actuators)
- Mounts using factory hangers for an easy at-home installation
- CARB (California) compliant, Emission Code 5
Sound & Valve Control
Because the system integrates with the factory Active Performance Exhaust Option, you keep the ability to command your tone. Closed valves produce a moderately aggressive character that pairs well with everyday driving, while opening the valves delivers a full-throated, aggressive sound level. No valve actuators are included in the kit — the system is designed to reuse your OEM actuators — and no heat shield is included.
Fitment
This kit fits 2018-2023 Ford Mustang GT coupes and convertibles with the 5.0L engine and the Factory Active Performance Exhaust Option. Everything needed for the job is in the box: all necessary parts, hardware, and detailed instructions are included, and the system is backed by Flowmaster’s Lifetime Limited Warranty. Note: this warning product carries a California Proposition 65 notice.
