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Flowmaster American Thunder Cat-Back Exhaust with X-Pipe (13-14 GT)

Item 18446
AmericanMuscle no longer carries the Flowmaster American Thunder Cat-Back Exhaust with X-Pipe (13-14 GT). Please check out 2015-2021 Mustang Cat-Back Exhaust for an updated selection.
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    Video Review & Installation

    Hey I'm Justin with, and I'm breaking down Flowmaster's American Thunder Catback exhaust, fitting the 2013 Mustang GT. Flowmaster offers a number of mufflers all with their own unique tone, in this case the American thunder for your GT Mustang is built around the iconic 60 series delta flow mufflers. These mufflers make this kit the perfect choice for the Mustang owner who is looking for an exhaust that will be relatively mild around town, yet still offer a good amount of bite whenever you get on the pedal. As a matter of fact I like to compare this exhaust to the Magnaflow street series, both offer a tone that's slightly more aggressive than stock, but without having to worry about waking up the neighbors, or getting the attention of Jonny Law. Besides these two 60 series mufflers, this system also boasts stainless steel construction throughout, including mandrel bent 3" tubing from tip to tip. It also features Flowmaster's unique scavenger style crossover pipe, which they say is great for picking up a little extra torque. Those 60 series mufflers are finished off in Flowmaster's signature black coating, which is great at resisting corrosion, and then finally, everything's going to exit out these two 4" polished tips. Since this is a Catback you can expect to spend about 2 hours underneath the car getting everything bolted up, but since there's no cutting required whatsoever you should be able to handle it using basic hand tools. Now let's hear how Flowmaster's American Thunder sounds compared to our factory exhaust.

    Product Information

    Features, Description, Reviews, Q&A, Specs & Installation


    • Aggressive Flowmaster 60-Series Delta Flow Sound
    • Durable 409 Stainless Steel Construction
    • 3" Mandrel-Bent Tubing
    • 4" Polished Stainless Steel Tips
    • Includes Scavenger X-Pipe And Two Flowmaster 60 Series Mufflers
    • Fits 2013-2014 GT


    Signature Flowmaster Sound. Give your coyote Mustang that unmistakeable Flowmaster sound with the American Thunder Cat-Back Exhaust system from AmericanMuscle. The Flowmaster American Thunder Cat-Back Exhaust with its mandrel bent tubing will greatly improve your Mustangs exhaust flow for an increase in power, and the included 60 Series Delta Flow Mufflers will improve your exhausts sound for a deep aggressive muscle car exhaust note.

    Race Car Growl. The included Scavenger X-Pipe not only helps increase power, but it also adds a loud raspy, race car growl to the sound of your exhaust with its modern "X" crossover pipe design.

    Reuses Stock Cats. The included Flowmaster Scavenger X-Pipe bolts up directly behind the stock catalytic converters with no cutting required saving you time and money. By reusing your stock catalytic converters, you ensure that your Mustang is smog-legal.

    Quality Construction.
    Constructed from durable 3" 16 gauge 409 stainless steel tubing for it's corrosion resistant properties the Flowmaster American Thunder Cat-Back features two 60 Series Delta Flow American Thunder mufflers with massive 4.0" diameter polished stainless steel tips for impressive muscle car looks and sound. As an added bonus the tips are embossed with the "Flowmaster" logo for true custom styling.

    This Flowmaster American Thunder Cat-Back exhaust system is designed to fit the 2013-2014 5.0L coyote Powered GT Mustang equipped with either aftermarket shorty headers or the stock manifolds. Does not fit Shelby GT500 models.


    CA Residents: WARNING: Cancer and Reproductive Harm -

    Installation & What's in the Box

    Installation Info

    What's in the Box

    • (1) Right muffler assembly
    • (1) Left muffler assembly
    • (1) Scavenger X pipe assembly
    • (1) Right intermediate pipe
    • (1) Left intermediate pipe
    • (4) Band clamps
    • (2) Hanger keepers

    Tech Specs

    Axle-Back Exhaust Specifications
    Piping Material: 409 Stainless Steel Tip Material : Polished Stainless Steel
    Piping Size: 3.0" Tip Size: 4.0"
    Muffler Type: Chambered Fitment: 2013-2014 GT

    Customer Reviews (23)

      Questions & Answers

      10 More Questions

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