Flowmaster's American Thunder Axle-back exhaust system for the 2015-2018 Ford Mustang is perfect for the person looking for a moderately aggressive sound level outside of the car, while maintaining a mild sound level inside, with all of the performance benefits that you would expect from Flowmaster. This bolt-on DOR (Dual Out Rear) emissions-legal system for cars with the 2.3L EcoBoost or 3.7L V6 engine features 3.00in inlet pipes that flow into a pair of Super 10 series mufflers for maximum performance. The system is built out of 409S stainless steel and utilizes 4.00in polished Stainless Steel Flowmaster embossed tips. The exhaust system is covered by Flowmaster's Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation. Note: This system fits hardtops and convertibles.
Features:
- Premium Flowmaster Quality
- Mandrel Bent Tubing
- Limited Lifetime Warranty
- Aggressive Exterior Exhaust Tone
- Incl. Hangers and Hardware For Easy Installation
- Axle Back System
- Dual Out Rear Exit
- Dyno Tuned for Maximum Performance
Holley Performance Emission Code 5: This part is legal for sale or use on Emissions Controlled Vehicles; Uncontrolled (Non-Emissions Controlled) Vehicles; and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations
Installation Notes:
Fits 2015-2021 Ford Mustang with 2.3L Ecoboost and 3.7L engines. Fits Coupes and Convertibles.

About Flowmaster
Manufacturer of performance exhaust systems, mufflers, performance air intakes, turbo boost modules, catalytic converters, race mufflers, headers and numerous exhaust accessories for late model cars, trucks, off-road, Jeeps, SUV’s, classic muscle cars, powersports vehicles and more. Flowmaster® gives you lots of exhaust choices with 12 designs of chambered mufflers, 3 styles of our exclusive “laminar-flow” mufflers and a new line of FlowFX “straight-through” performance mufflers, along with 5 sound categories of exhaust systems, giving you the customer, the power to custom tailor the sound of your vehicle whether you prefer mild, moderate or aggressive tones and sound levels. Since 1983, Flowmaster is the company you can trust, and has led the industry in offering only the best products you can buy for your vehicles.

Vehicle Fitment:
The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make |
Model |
Submodel |
Years |
Engine |
Fitment Notes |
Ford |
Mustang |
EcoBoost Premium |
2015 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; 3.0 in. Outlet; Super 10 Delta Flow Mufflers; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost Premium |
2016 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; 3.0 in. Outlet; Super 10 Delta Flow Mufflers; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost Premium |
2017 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; 3.0 in. Outlet; Super 10 Delta Flow Mufflers; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost Premium |
2018 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; 3.0 in. Outlet; Super 10 Delta Flow Mufflers; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost |
2015 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; 3.0 in. Outlet; Super 10 Delta Flow Mufflers; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost |
2016 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; 3.0 in. Outlet; Super 10 Delta Flow Mufflers; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost |
2017 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; 3.0 in. Outlet; Super 10 Delta Flow Mufflers; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost |
2018 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; 3.0 in. Outlet; Super 10 Delta Flow Mufflers; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
V6 |
2015 |
3.7L / 227 / V6 |
Dual; Dual Rear Exit; 3.0 in. Outlet; Super 10 Delta Flow Mufflers; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
V6 |
2016 |
3.7L / 227 / V6 |
Dual; Dual Rear Exit; 3.0 in. Outlet; Super 10 Delta Flow Mufflers; 409 Stainless Steel;50 State Legal / California Emissions Compliant |