2012-13 Ford Mustang Flowmaster American Thunder Boss Exhaust System - S197 by Flowmaster

Mustang Flowmaster American Thunder Boss Exhaust System (12-13)

Details   |  Description   |  Videos   |   Community Q&A
Mustang Flowmaster American Thunder Boss Exhaust System (12-13)
  • Flowmaster Mustang American Thunder Boss Exhaust System (12-13) 817553
  • Flowmaster Mustang American Thunder Boss Exhaust System (12-13) 817553
  • Flowmaster Mustang American Thunder Boss Exhaust System (12-13) 817553

Add more power & sound to your Boss 302 Mustang with a Flowmaster American Thunder cat back system!

Item #FLO-817553

Everyday Low Price: $923.45

Ships by Friday, May 01

Add to cart


  • Power Improvement You Can Feel
  • Unmistakable Flowmaster Sound
  • Bolt On Installation


  • Includes Optional Larger Side Pipe Plates
  • 409S Stainless Steel Construction
  • X-Pipe Increases Torque
  • Tuned 60 Series Mufflers
  • Limited Lifetime Warranty

What's in the Box

  • (2) Lead Pipes
  • (2) Intermediate Pipes
  • (2) Axle Back Mufflers
  • Installation Hardware
  • Installation Instructions

Made in the USA

Product Description

Increase the performance in your 2012-2013 Mustang Boss 302 with a Flowmaster American Thunder cat back exhaust system.Flowmaster proudly introduces our new 817553 American Thunder Cat-back exhaust, engineered specifically for the 2012-2013 Boss 302 Mustang. A full 3.00” diameter throughout, this all-409S stainless steel true Cat-back system features our patented Scavenger X pipe, and incorporates flanges to retain the OE side-exit pipes. The custom-engineered 60 Series Delta Flow mufflers deliver an aggressive, powerful exterior sound and a moderate interior tone with very little resonance. The 4.00” diameter polished tips provide the finishing touch to the back of the car. The bolt-on exhaust comes with all necessary installation hardware and even includes side-pipe spacer plates with larger .75” holes- a popular modification in itself. The system provides a substantial performance gain, and with the detailed instructions is easily installed at home or by a professional. Like all Flowmaster stainless steel systems, our Limited Lifetime Warranty means you’ll never need to buy another exhaust for your Mustang Boss 302.

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

Product Videos

Mustang Flowmaster Exhaust Systems Review

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!


Community Q&A

Product Reviews

Vehicle Applications

Ford Mustang - 2012 (12) - 2013 (13)

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!

Look for Similar Items by Category

2010-2014 Mustang Parts » 2010-2014 Mustang Exhaust » 2010-2014 Mustang Cat Back Exhaust Systems
Flowmaster Exhaust Rebate: March 2015

Products by Vehicle