Description
Overview
The Flowmaster American Thunder Axle-back Exhaust System is engineered for the 2015-2023 Ford Mustang equipped with the 2.3L EcoBoost or 3.7L engine, delivering a moderately aggressive tone outside the car while keeping the cabin comfortably mild. Built as a true bolt-on upgrade, it pairs Flowmaster’s proven American Thunder engineering with the deep, purposeful character of the Super 10 Series muffler package, making it an ideal choice for Mustang owners who want a serious exhaust note without a raspy or overwhelming drive.
At the heart of the system are 3.00-inch mandrel-bent inlet pipes that feed a pair of Super 10 Series mufflers, promoting smooth flow and maximum performance. Every component is constructed from 409S stainless steel for long-lasting durability, and the system is finished with large 4.00-inch polished stainless steel tips featuring an embossed logo for a clean, aggressive appearance out back.
Key Benefits
This axle-back setup is a smart middle ground for driving enthusiasts: aggressive enough to turn heads when you’re on the throttle, yet moderate enough to remain livable on daily commutes and highway cruising. As an emissions-legal, CARB-compliant system, it lets you enhance your Mustang’s sound and style with confidence, and it’s backed by Flowmaster’s Lifetime Limited Warranty.
- 3.00-inch mandrel-bent inlet pipes for smooth, efficient flow
- Dual Super 10 Series mufflers for maximum performance and aggressive sound
- 409S stainless steel construction for lasting durability
- Large 4.00-inch polished stainless steel tips with embossed logo
- Flanged mount design with all necessary parts and hardware included
- CARB (California) compliant and emissions-legal — Emission Code 5
Sound Character
The American Thunder Axle-back is tuned to deliver an aggressive-to-moderate exhaust note. Note that the overall sound level is quieted by the factory resonators. If you’re after even more volume from your EcoBoost or 3.7L Mustang, Flowmaster offers a No Resonator X-Pipe (#81107) and Y-Pipe (#81108) to unlock additional sound and complete the system.
Fitment
This system is designed specifically for 2015-2023 Ford Mustang models with the 2.3L EcoBoost or 3.7L engine in a 2WD configuration. Engineered for an easy fit, it arrives with all the hardware needed for a straightforward, bolt-on installation. The kit includes the dual mufflers and tail pipes; a heat shield is not included.
For Mustang owners who want to add attitude and improved flow while retaining a refined interior experience, the Flowmaster American Thunder Axle-back Exhaust System offers a proven, warranty-backed upgrade that looks as good as it sounds.
