This Outlaw Axle-back exhaust system is specifically designed for the 2018-19 Ford Mustang GT coupe and convertibles with the 5.0L engine and Active Performance Exhaust Option. System features include a pair of race-proven Outlaw mufflers for a very aggressive exterior sound level with a noticeable interior tone and large 3.00-inch mandrel-bent 409S stainless steel tubing for high flow, durability, and longevity. Add to that, a pair of high-quality valves to accommodate the factory exhaust actuators for when you really want to open up the sound. The system is finished off with quad 4.00-inch black ceramic coated stainless steel tips for an aggressive look that demands attention, the same as the sound coming from the Outlaw mufflers. Includes all necessary parts, hardware and detailed instructions for an easy installation you can do at home.
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:
Fits 2018-2021 Mustang GT 5.0L Coupes & Convertibles with Factory Active Performance Exhaust Valves.

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 |
GT Premium |
2018 |
5.0L / 302 / V8 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Quad Black Ceramic Coated Tips w/Valves; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
GT Premium |
2019 |
5.0L / 302 / V8 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Quad Black Ceramic Coated Tips w/Valves; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
GT |
2018 |
5.0L / 302 / V8 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Quad Black Ceramic Coated Tips w/Valves; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
GT |
2019 |
5.0L / 302 / V8 |
Dual; Dual Rear Exit; Incl. 3 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Quad Black Ceramic Coated Tips w/Valves; 409 Stainless Steel;50 State Legal / California Emissions Compliant |