American Thunder exhaust systems deliver the aggressive sounds you want, as well as the performance gains you demand. This T409 stainless steel American Thunder Axle-back for the 2013 to 2014 Mustang GT features specially modified Super 44 series mufflers with polished 4.00 in. stainless tips and is a direct bolt on for the restyled Mustang. A lifetime limited warranty provides assurance that this American made exhaust will deliver that famous Flowmaster sound for many years to come.
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
- Stainless Steel Construction
- Patented Delta Flow Technology
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 2013-2014 Ford Mustang GT 5.0L Coupes & 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 |
GT |
2013 |
5.0L / 302 / V8 |
Dual; Dual Rear Exit; Incl. 3.0 in. Tubing/Super 44 Series(TM) Mufflers/4.0 in. Polished Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant |
Ford |
Mustang |
GT |
2014 |
5.0L / 302 / V8 |
Dual; Dual Rear Exit; Incl. 3.0 in. Tubing/Super 44 Series(TM) Mufflers/4.0 in. Polished Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant |