15 Different Muffler Styles & Sound Levels

Flowmaster Exhaust Systems - SHIPS FREE - AutoAnything

Flowmaster 17421 Axle-back System - Single Rear Exit - American Thunder - Moderate Sound

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  • TAG : Flowmaster Original 40 Series Mufflers in stock now
  • Flowmaster's American Thunder series mufflers and exhaust systems are quick bolt-on solutions to both performance and sound. American Thunder systems are available for '65-'73 classic Mustangs as well as '79-'04 Fox-bodies, just in case you happen to be interested in a throaty bark at the tailpipes. Flowmaster continues its Mustang spirit with the American Thunder series systems for '05-'07 Mustangs. We ordered the American Thunder muffler designed specifically for new V-6 Mustangs (PN 17421) and were pleasantly surprised by the rich tone.

    We stopped by LaBree Motor-sports in Southern California where Brent LeBree and his son, Greg, were installing a Flowmaster American Thunder muffler on an '06 Mustang coupe.

  • Grabber Orange
    -Flowmaster American Thunder Mufflers

    Vista Blue
    -Flowmaster American Thunder Mufflers
    -Vortech Supercharger
    -Ford Racing X-pipe
    -JBA ceramic coated shorty headers

Flowmaster American Thunder Exhaust System