2015-17 Ford Mustang Flowmaster American Thunder Cat Back Exhaust Kit GT Fastback - S550 - 5.0 by Flowmaster

Mustang Flowmaster American Thunder Cat Back Exhaust Kit (15-17) 5.0 Fastback

Details   |  Description
  • Flowmaster Mustang American Thunder Cat Back Exhaust Kit (2015) GT 5.0 817730
Mustang Flowmaster American Thunder Cat Back Exhaust Kit (15-17) 5.0 Fastback

Add that aggressive Flowmaster sound to your 2015-2017 Mustang GT with this American Thunder Cat Back!

Item #FLO-817730
MPN# 817730

Everyday Low Price: $1,018.97

Ships from supplier by Wednesday, October 26

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  • Aggressive Exhaust Tone
  • Improved Performance
  • Better Exhaust Flow
  • Lifetime Limited Warranty


  • 409 Stainless Steel Construction
  • 4" Polished Double Wall Exhaust Tips
  • Easy Bolt On Installation
  • Made in the USA

What's in the Box

  • (1) American Thunder Cat Back Exhaust Kit

Made in the USA

Product Description

American Thunder Cat Back Exhaust Kit
Have your S550 Mustang GT sounding more aggressive with this Flowmaster American Thunder Catback Exhaust kit. This kit not only gives your 2015-2017 Mustang an aggressive new exhaust tone, it improves exhaust flow using Super 44 mufflers for increased horsepower and torque. As an American Thunder system, it delivers an aggressive exterior sound level and a moderate interior tone that is suited to the enthusiast who wants to be heard. Flowmaster has designed the American Thunder Cat Back Exhaust kit so it will install using the factory hangers for a superior fit and finish. These kits are dyno proven for maximum performance. Flowmaster products are proudly Made in the USA! Pick up a kit today and get your 2015-2017 Mustang sounding better than ever!

High Quality Stainless Steel Construction
This catback exhaust kit is made with 3" mandrel bent, 409 stainless steel to give you maximum performance for your 5.0 engine. This combination allows you to get more power while having an exhaust system that will last a lifetime.

Will not fit the convertible model Mustang.

- Fits 2015-2017 Mustang GT Coupe

Flowmaster Exhaust Warranty - Click Here

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    Vehicle Applications

    Ford Mustang - 2015 (15) - 2016 (16) - 2017 (17)

    About This Brand

    Flowmaster - The Exhaust Technology Company
    Flowmaster operates the only exhaust Research & Design facilities of its kind in the world, centered around the SuperFlow SF-7100 engine dynamometer complete with E.C.A. (engine cycle analysis) equipment and also SuperFlow chassis dyno's.

    Through use of these dyno's, Flowmaster's engineering staff can track the complete engine cycle in millionths of a second and can obtain exact technical data of each degree of cam rotation, from induction to the tip of the exhaust system, while also showing the power numbers that really matter, the power numbers "to the ground."

    Flowmaster also utilizes Spectrum Analyzers to fine "tune" the sound of each of the eleven different series of mufflers that Flowmaster currently offers, both for peak performance and just the right sound levels and tones. Flowmaster's dedication to quality is what makes them the exhaust industry leader for Latemodel Mustangs and SVT Lightnings!

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