2005-09 Mustang Flowmaster Axle Back V6 4.0L by Flowmaster

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Flowmaster Mustang Axle Back (05-09) V6 4.0L 17421

Flowmaster Exhaust has always been the "signature sound" for Mustangs and this 05-09 V6 Mustang Flowmaster American Thunder Axle back Muffler kit does not disappoint!

Item #FLO-17421
MPN# 17421

Your Price: $263.68

Market Price:$334.65
You Save 21.21 % ($70.97)

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  • Easy Install
  • Improved Throttle Response
  • More Power
  • Better Mileage


  • Signature Aggressive Sound
  • Aluminized Steel Black Finish Muffler
  • 3 Year Warranty

What's in the Box

  • (1) Flowmaster Axle Back Muffler
  • (1) Instructions
  • (1) Warranty Card
  • (1) Decal

Made in the USA

Product Description

Flowmaster Axle-Back
Flowmaster announces the release of our new kit for the 2005-2009 Ford Mustang 4.0L V6. It features a specially-designed 5" X 10" muffler, which provide minimal interior resonance while delivering a deep and aggressive exterior tone. Through extensive testing this kit has shown some horsepower and torque gains. Features a polished tip with Flowmaster embossed logo.

This aggressive sounding system is designed to replace the original rear mounted muffler located behind the rear axle. With easy fit in mind, the system is mandrel bent for maximum performance and includes a specially selected muffler to support the performance image of the car. As an American Thunder system, it delivers an aggressive exterior tone with moderate interior sound level that is suited to the enthusiast who wants their performance to be heard. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, the system does require cutting of the factory system and includes all necessary parts and hardware for easy installation.

- Fits 2005-2009 Ford Mustang V6

Flowmaster Exhaust Warranty - Click Here

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!

Customer Photos (3)

Vehicle Applications

Ford Mustang - 2005 (05) - 2006 (06) - 2007 (07) - 2008 (08) - 2009 (09)

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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