Flowmaster 817574 American Thunder | 86-04 Mustang GT & V8 Cat-Back

The Flowmaster American Thunder Stainless Steel Cat-Back Exhaust System (Part #817574) delivers the iconic, aggressive exhaust note for a huge range of Mustang models, covering 1986–2004 Mustang GT and V8 applications. This kit provides a complete, high-quality solution from the catalytic converters back.

Iconic American Thunder Sound Engineered using Flowmaster's signature chambered muffler design, this system produces the original, deep, aggressive "American Thunder" sound. It is designed for enthusiasts who want a powerful, commanding roar under acceleration, coupled with a classic muscle car rumble at idle.

Premium and Durable Construction This entire cat-back system is built from high-quality, mandrel-bent 409S stainless steel tubing. This superior construction is designed for maximum exhaust flow, long-term durability, and excellent resistance to corrosion, ensuring the system lasts through years of driving.

Key System Features:

• Tip Style: Includes highly polished stainless steel tips for a sleek, finished look exiting under the rear valance.
• Mandrel Bent: Ensures maximum exhaust flow and minimizes back pressure throughout the entire system.
  
  
• Direct Bolt-On: Engineered for a precise, direct-fit installation onto the factory catalytic converters, with all necessary over-axle pipes and hardware included.

Vehicle Fitment Note: This system covers many different chassis styles (Fox Body, SN95, New Edge). The components are designed to cover the common V8 applications within the 1986–2004 Ford Mustang range.