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2011-12 Ford Mustang 5.0L 5.4L Flowmaster American Thunder Axle-Back Exhaust System GT-GT-500 - S197

Overview   |  Benefits   |  Features   |  In the Box   |  Description   |  Videos   |  Customer Photos   |  Reviews
Mustang Flowmaster American Thunder Axle-Back Exhaust System (11-12) 5.0L 5.4L
Give your 11-14 Mustang S197 more power with a Flowmaster American Thunder axle-back exhaust system.

Item# FLO-817496

Your Price: $434.99

Market Price:$478.48
You Save 10.00 % ($43.49)

In Stock!  


  • Increased Horsepower & Fuel Economy
  • Aggressive Sound
  • Direct Bolt On Installation
  • 14lbs Lighter Than Stock Axle-Back!


  • Stainless Steel Construction
  • Utilizes Factory Hanger Mounts
  • Easy, Clamp-On Design
  • Flowmaster Lifetime Warranty
  • Polished 4" Tips
  • Made in the USA

What's in the Box

  • (1) Flowmaster 3" Axle-Back Pair

Made in the USA

Product Description

Get yourself a Flomaster American Thunder axle back exhaust system for great sound and extreme performance for your 2011-12 Mustang. Designed for the serious enthusiast who really wants to get great sound from their Mustang, these mufflers will produce a deep & agressive exterior tone when on the throttle. You'll notice it inside as well letting you hear your engine roar. Stainless steel construction and easy installation makes this a top quality product that's ready to bolt on. Pick up a set today and feel the thunder!

As with all Flowmaster products, they are built in the USA and backed by their Lifetime warranty.

Product Videos

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

(5) Customer Photos

Customer Reviews

5 stars
5.0 out of 5 stars - based on 2 reviews

  Horsepower Speaks loudly
By on 6/22/2014
Installed on my 2011 GT. Very good quality, very simple install in my driveway. Fits and looks better than stock. As for the sound...much, much louder than I anticipated! Some of that may be do to that I have an off road x-pipe on the car, that by it's self made the car louder. Sounds VERY VERY good when you get on it, very deep base, HP sound : ) But it's a little too loud inside the car. I installed 2 layers of carpet padding on the floor of the trunk, up the back seats and under the speaker area in the back window and that killed a lot of that loud, annoying drone enough so I can keep the mufflers on the car.

Yes, I would recommend this item to a friend!

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  Great sound and easy install
By on 7/8/2014
I installed these in about an hour using a socket wrench, floor jack and jack stand. Very easy install and they sound and look GREAT on my GT500. I really like the way the tips are finished with the rolled edge as opposed to the OE look.

Yes, I would recommend this item to a friend!

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Vehicle Applications

Ford Mustang - 2011 (11) - 2012 (12)

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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