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Flowmaster Performance Parts
Flowmaster 17421
Flowmaster 17421 American Thunder Exhaust System 600x600
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Flowmaster 17421
Flowmaster 17421 "American Thunder" Axle-Back Exhaust System
2005 - 2009 Ford Mustang V6

• Mandrel Bent 16ga Aluminized Tubing
• Incl Hangers and Hardware For Easy Installation
• Axle-Back System
• Dyno Tuned for Maximum Performance
• Moderate Sound
Retail Price: $324.91
Our Price: $248.97
UPC 700042020584
Free Shipping and Handling for orders over $99!
(US only. Excluding any oversize charges.)
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1Estimated Shipping Dates are based on available inventory and the nearest warehouse.
Performance Parts is a Flowmaster authorized performance retailer
Product Info Related Items
Flowmaster 17421 "American Thunder" Axle-Back Exhaust System
2005 - 2009 Ford Mustang V6

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 American 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.


2.5" Inlet/ 2.5" Outlet
Single Rear Exit
60 Series Delta Flow Muffler
Shipping Weight/Dimensions:
Weight:22.00 lbs
Height:10.00 in.
Length:34.00 in.
Width:13.50 in.
Shipping from warehouses in the U.S. and Canada!
Performance Parts has over 20 warehouses in the U.S. and Canada so you can get your parts duty free! Call for availability.
None listed.
- Last Updated: 2016-05-13 16:04:23 -
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