1 of 7
1 of 7
Flowmaster 17421 - American Thunder Axle Back Exhaust System
1989 Ford Mustang
Jason Se
2006 Ford Mustang Base
Nate Johnson
1995 Ford Mustang
Brett Moffett
1988 Ford Mustang
Michael Curbelo
1998 Ford Mustang
Darrius Quarles
1995 Ford Mustang
Brett Moffett
1998 Ford Mustang
Alex McCauley
2011 Ford Mustang
Dan Hollingsworth
2000 Ford Mustang
Damien Stalnaker
2005 Ford Mustang
Robert Bowers
This aggressive sounding system is designed to replace the original rear mounted mufflers located behind the rear axle. With easy fit in mind, the system is mandrel bent for maximum performance and includes specially selected mufflers to support the performance image of the car. As an America Thunder system, it delivers an aggressive exterior tone with moderate interior sound level that is suited to the enthusiast who wants their performance to be heard. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, the system includes all necessary parts and hardware for easy installation.
For the American Thunder Axle Back Exhaust System
Color | Black |
Exhaust Series | American Thunder |
Exhaust Type | Single |
Exit Position | Single Rear |
Exit Style | Straight |
Heat Shield Attached | No |
Inlet Diameter | 2.500 in. |
Material | Aluminized Steel |
Muffler Count | 1 |
Muffler Part Number | Kit Only |
Muffler Series | 60 Series Delta Flow |
Outlet Diameter | 2.500 in. |
Outlet Outside Diameter | 3.500 in. |
Single or Dual | Single |
Sound Level | Moderate |
System Type | Axle Back |
Tail Pipe Diameter | 2.500 in. |
Tip Diameter | 3.500 in. |
Tip Quantity | 1 |
Title | Flowmaster 17421 Axle-back System 409S - Single Rear Exit - American Thunder - Moderate Sound |
Tubing Diameter | 2.500 in. |
*Some manufacturer restrictions apply.
Manufacturer of performance exhaust systems, mufflers, cold 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.
Based in California with 3 warehouses across the country, we’re sending out shipments everyday of the week, even Saturdays. Because your next mod shouldn’t have to wait.
The best modders use Wheelwell to build their dream rides.