Flowmaster 17421 American Thunder Axle Back Exhaust System Flowmaster 17421
$663.98
This American Thunder axle-back exhaust system is constructed from 16-gauge mandrel-bent aluminized steel and includes a pair of specially designed 60 Series performance muffler with the sound that goes hand...
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This American Thunder axle-back exhaust system is constructed from 16-gauge mandrel-bent aluminized steel and includes a pair of specially designed 60 Series performance muffler with the sound that goes hand in hand with the performance image of the Mustang. The muffler is finished off with large 4.00-inch polished stainless steel tips to fill out the exhaust cutouts in the rear valance for a muscular appearance that matches the sound. As an American Thunder system, it delivers a moderate interior tone and exterior sound that is suited to the enthusiast who wants their performance to be heard. Like all Flowmaster exhaust 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. Note: Fits both coupes and convertibles.
Specifications:
| Description_DES | American Thunder Axle Back Exhaust System |
| Description_EXT | American Thunder Axle Back Exhaust System; Single; Single Side Exit; 2.5 in. Outlet; 5x10 in. Muffler Assembly; 3.5 in. Rolled Edge Stainless Tip; |
| Description_FAB | Mandrel Bent 16ga Aluminized Tubing |
| Description_FAB | Moderate Exterior Exhaust Tone |
| Description_FAB | Mild Exterior Exhaust Tone |
| Description_FAB | Incl. Hangers and Hardware For Easy Installation |
| Description_FAB | Connects After Factory Catalytic Converter |
| Description_FAB | Dual Out Rear Exit |
| Description_FAB | Dyno Tuned for Maximum Performance |
| Description_FAB | Premium Flowmaster Quality |
| Description_MKT | This American Thunder axle-back exhaust system is constructed from 16-gauge mandrel-bent aluminized steel and includes a pair of specially designed 60 Series performance muffler with the sound that goes hand in hand with the performance image of the Mustang. The muffler is finished off with large 4.00-inch polished stainless steel tips to fill out the exhaust cutouts in the rear valance for a muscular appearance that matches the sound. As an American Thunder system, it delivers a moderate interior tone and exterior sound that is suited to the enthusiast who wants their performance to be heard. Like all Flowmaster exhaust 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. Note: Fits both coupes and convertibles. |
| Description_SHO | Exhaust System Kit |
This Part Fits:
| Year | Make | Model | Submodel | Notes |
|---|---|---|---|---|
| 2005 | Ford | Mustang | Base | |
| 2006 | Ford | Mustang | Base | |
| 2007 | Ford | Mustang | Base | |
| 2008 | Ford | Mustang | Base | |
| 2009 | Ford | Mustang | Base |
Shipping Information
We offer FREE shipping on all orders within Canada. Most orders ship within 1-2 business days.
Standard delivery typically takes 3-7 business days depending on your location.
Returns Policy
We accept returns within 30 days of purchase. Items must be in original condition with all packaging.
For returns or exchanges, please contact our customer service team.

