This new Outlaw Axle-back exhaust system is specifically designed for all 2015-19 Ford Mustang coupes and convertibles with the 2.3L Ecoboost or 3.7L V6 engines. System features include large 3.00-inch mandrel-bent tubing flowing into a pair of race-proven Outlaw series mufflers for an aggressive exterior sound level, with a noticeable interior tone. Other features include a pair of large 4.00-inch black ceramic coated stainless steel tips for an aggressive look and the system uses the factory hangers for a quick and easy installation. The system includes all necessary parts, hardware, and instructions and is covered by our Lifetime Limited Warranty.
Features:
- 4 in. Black Ceramic Coated Stainless Steel Tips
- Aggressive Race Proven Outlaw Mufflers
- Dyno-Tuned For Maximum Performance
- Large Mandrel-Bent 3 in. Tubing
- Full Stainless Steel Construction
- Easy Installation
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:
2015-2021 Ford Mustang, 2.3L Ecoboost & 3.7L engines. Fits both 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; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost Premium |
2016 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost Premium |
2017 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost Premium |
2018 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost Premium |
2019 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost |
2015 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost |
2016 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost |
2017 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost |
2018 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
EcoBoost |
2019 |
2.3L / 140 / L4 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
V6 |
2015 |
3.7L / 227 / V6 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
V6 |
2016 |
3.7L / 227 / V6 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
V6 |
2017 |
3.7L / 227 / V6 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Black Mufflers/4 in. Black Ceramic Coated Tips;50 State Legal / California Emissions Compliant |