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2011-12 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
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

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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