2011-14 Ford Mustang 5.0L Flowmaster American Thunder 3" Catback Exhaust Kit GT - S197 by Flowmaster

Mustang Flowmaster American Thunder 3" Catback Exhaust Kit (11-14) 5.0L

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Mustang Flowmaster American Thunder 3" Catback Exhaust Kit (11-14) 5.0L
  • Flowmaster Mustang American Thunder 3" Catback Exhaust Kit (11-14) GT 5.0L 817500
  • Flowmaster Mustang American Thunder 3" Catback Exhaust Kit (11-14) GT 5.0L 817500
  • Flowmaster Mustang American Thunder 3" Catback Exhaust Kit (11-14) GT 5.0L 817500

Improve horsepower & sound with this Flowmaster American Thunder catback exhaust for 2011-14 Mustang!

Item #FLO-817500

Everyday Low Price: $823.64

Ships from supplier by Monday, July 06
What does this mean?

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  • Utilizes Factory Hanger Mounts/Locations
  • Unmatched Sound


  • Stainless Steel Construction
  • X-Pipe Improves Torque
  • Max Flow 60-Series Delta Flow Mufflers

What's in the Box

  • (1) Pair of Delta Flow 60 Series Mufflers with 4" polisted stainless Tips
  • (1) Pair of 409S 3" Stainless Steel Tail Pipes
  • (1) Direct fit 3" X-Pipe
  • All Needed Hardware
  • Detailed Instructions

Made in the USA

Product Description

Add a 3" cat back Flomaster American Thunder exhaust system to your 2011-2014 Mustang for serious power and great sound! This kit is complete to replace your existing exhaust system after the cats where your factory mid pipe will be used. Made from high grade stainless steel, this system includes an X pipe which was designed to increase torque, a pair of 60-Series Delta Flow mufflers give your Mustang that throaty sound and more power under your foot. You'll love the sound every time you get in the throttle!

This Flowmaster stainless steel system uses a Scavenger Series X-pipe, mandrel-bent 3" tail pipe tubing, specially selected Delta-Flow technology Flowmaster mufflers, and polished 304 stainless steel tips and is covered by Flowmaster's Limited Lifetime warranty. It features an aggressive exterior sound level and a moderate interior tone that is suited to the enthusiast who wants to be heard. With maximum performance and easy fit in mind, these systems include all the necessary parts and hardware for a simple installation.

* * * NOTE: This Flowmaster Cat-Back exhaust kit is intended to be used with the stock mid pipe.* * *

Product Reviews

Community Q&A (1)

Vehicle Applications

Ford Mustang - 2011 (11) - 2012 (12) - 2013 (13) - 2014 (14)

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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