Flowmaster's Outlaw Axle-back systems are race-oriented systems designed to replace original rear mounted mufflers located behind the rear axle using factory style connections. Outlaw systems deliver an ultra aggressive interior and exterior tone and are suited to the enthusiast who wants the most aggressive components they can purchase. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.
Features:
- Mandrel Bent 16ga 409 Stainless Tubing
- Limited Lifetime Warranty
- Aggressive And Powerful Exterior Exhaust Tone
- Incl. Hangers and Hardware For Easy Installation
- Axle Back System
- Dual Out Rear Exit
- Dyno Tuned for Maximum Performance
- Premium Flowmaster Quality
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 2005-2010 Ford Mustang GT, GT500 with a 4.6L or 5.4L engine.
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 |
Bullitt |
2008 |
4.6L / 281 / V8 |
Dual; Dual Rear Exit; Incl. 3.0 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Polished Stainless Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
Bullitt |
2009 |
4.6L / 281 / V8 |
Dual; Dual Rear Exit; Incl. 3.0 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Polished Stainless Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
GT |
2005 |
4.6L / 281 / V8 |
Dual; Dual Rear Exit; Incl. 3.0 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Polished Stainless Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
GT |
2006 |
4.6L / 281 / V8 |
Dual; Dual Rear Exit; Incl. 3.0 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Polished Stainless Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
GT |
2007 |
4.6L / 281 / V8 |
Dual; Dual Rear Exit; Incl. 3.0 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Polished Stainless Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
GT |
2008 |
4.6L / 281 / V8 |
Dual; Dual Rear Exit; Incl. 3.0 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Polished Stainless Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
GT |
2009 |
4.6L / 281 / V8 |
Dual; Dual Rear Exit; Incl. 3.0 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Polished Stainless Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
GT |
2010 |
4.6L / 281 / V8 |
Dual; Dual Rear Exit; Incl. 3.0 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Polished Stainless Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
Shelby GT |
2007 |
4.6L / 281 / V8 |
Dual; Dual Rear Exit; Incl. 3.0 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Polished Stainless Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
Shelby GT |
2008 |
4.6L / 281 / V8 |
Dual; Dual Rear Exit; Incl. 3.0 in. Tubing/Outlaw(TM) Mufflers/4.0 in. Polished Stainless Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant |