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  1. Flowmaster 99-04 Cobra 409SS American Thunder Cat-Back
    $786.95

    Out of stock

    For the person who wants the look of a traditional dual exhaust system with all the benefits that a Flowmaster Cat-back exhaust system provides. D.O.R. (Dual Out Rear) systems are the perfect choice. American Thunder systems deliver a moderate to aggressive interior and exterior tone and are 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, these systems include all necessary parts and hardware for easy installation.

    • Mandrel Bent 16ga 409 Stainless Tubing
    • Moderate Exterior Exhaust Tone
    • Incl Hangers and Hardware For Easy Installation
    • Connects After Factory Catalytic Converter
    • Dyno Tuned for Maximum Performance
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  2. Flowmaster 99-04 Mustang Cobra American Thunder Catback
    $745.95

    Flowmaster 99-04 Cobra American Thunder Catback

  3. 2.50 Dia. Tubing
  4. 5.00 X 10.00
  5. 3.00 Stainless OEM Style Tips
  6. American Thunder
  7. Dual Out Rear


  8. Flowmaster's systems will improve acceleration and passing power, as well as help improve fuel mileage. Every system is individually engineered and dyno-tested for each application and includes all required mounting hardware. All tubing is mandrel bent for superior exhaust gas flow, and is a key to the system's performance improvements. Both mufflers and tubing are fabricated from aluminized steel for corrosion resistance.

    American Thunder
    Looking for the famous, full-on "Flowmaster tone?" Look no further. This American Thunder system will deliver the aggressive tone you want, as well as the performance you demand.

    Delta Flow Technology
    Developed from Flowmaster's line of Delta Force® race mufflers, Delta Flow® technology provides superior scavenging of exhaust gases even over a comparable (standard) Flowmaster muffler. This results in increased horsepower, torque and fuel economy, along with reductions in exterior sound levels and interior resonance. These three deflectors function properly only when they've been precisely placed and welded to exact specifications. Together they provide superior reductions in exterior sound levels as well as resonance transmitted through the exhaust system and into the vehicle.

     

    Installation Instructions

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