FREE SHIPPING & HANDLING!*                           Order by 11 PM EST for Same Day Shipping!

Flowmaster 817273 - Flowmaster American Thunder Exhaust Systems - Cars

Flowmaster 817273 - Flowmaster American Thunder Exhaust Systems - Cars


American Thunder Header-Back Exhaust System
  • 1964-66 Ford Mustang V8
  • 2.5" Tubing, 2.5" Polished SS Tips
  • Dual Rear Exit
  • Super 44 Series Muffler
  • 409S Stainless Steel

    Flowmaster 817273 - Flowmaster American Thunder Exhaust Systems - Cars Details

    Ford Mustang V8

    Flowmaster's American Thunder system for 1964-1966 Ford Mustangs delivers increased horsepower, torque and throttle response. Featuring dual exhaust tips, this 2.50-inch mandrel bent system consists of a header adapter pipes, a welded H-pipe assembly and Super 44 Series mufflers. The system includes dual 2.50-inch tailpipes with full-length polished 304 stainless tips that exit straight out the back under the rear valence. All the necessary parts and hardware are included to provide a great fitting installation. This American Thunder system will typically produce an aggressive interior and exterior sound level, however it will vary depending on the level of engine modification. Constructed in durable 409s stainless steel, the system is covered by Flowmaster's limited lifetime warranty.

    Key Features:

  • Stainless Steel Construction
  • Mandrel Bent Tubing
  • Great Flowmaster Sound
  • Limited Lifetime Warranty
  • Dyno Tuned For Maximum Performance

  • Flowmaster 817273 - Flowmaster American Thunder Exhaust Systems - Cars

    Best suited to enthusiasts who want their cars to be heard while improving throttle response, power, and mileage. American Thunder Exhaust Systems are mandrel bent for optimum performance with specially selected mufflers. Made in the USA.

  • Premium Flowmaster quality
  • Axle-back, cat-back, or header-back
  • 16-gauge stainless or aluminized steel tubing
  • Moderate to aggressive exterior exhaust tone
  • Necessary hangers & hardware included for simple installation

    JEGS Easy Kits are designed by JEGS professionals to help you get all the performance parts you need.

  • Flowmaster 389-817273

    Inlet Size (in.)
    Outlet Size (in.)
    409 Stainless Steel
    Inlet Size (in.)
    Exit Position
    Dual Rear
    Exhaust Type
    Exit Style
    Items You May Also Consider
    JEGS Performance Products 30732 - JEGS Preformed Stainless Steel Exhaust Band Clamps
    Only $8.99

    Royal Purple 10035 - Royal Purple Maxfilm Penetrating Lubricant
    Only $6.62

    Grime Boss A541S30X - Grime Boss Hand Wipes
    Only $9.99

    Grime Boss A544R10X - Grime Boss Hand Wipes
    Only $4.69