Flowmaster Axle-Back Exhaust System American Thunder Stainless Steel 3" With 4" Polished Quad Exhaust Tips With Active Exhaust GT 2018-2021



  • Aggressive Exhaust Tone
  • Stainless Steel Construction
  • Made In The USA
  • Bolt On Installation
MSRP $1,440.00
You save 10%

Flowmaster 3" Stainless Steel American Thunder Axle-Back Exhaust System with 4" Polished Quad Exhaust Tips for 2018, 2019, 2020 and 2021 GT Mustangs with the Active Exhaust Option.

Have you decided to toss that lame factory exhaust on your 2018-2021 GT Mustang? Fantastic--upgrade your new pony with this aggressive Flowmaster 3" Stainless Steel American Thunder Axle-Back Exhaust System with 4" Polished Quad Exhaust Tips (817799) right away! Place your order today with CJ Pony Parts!

American Thunder Axle-Back Kit Features:
- Direct-fit upgrade for 2018-2021 GT Fastback and Convertible Mustangs
- Dyno tested to achieve maximum performance
- Provides a moderately aggressive exhaust sound
- Manufactured from superior 409 stainless steel mandrel-bent 3" tubing
- Features Flowmaster's patented Delta Flow Technology
- Includes black powder-coated Super 44 Series mufflers
- Also includes premium-quality polished 4" double wall angle-cut quad exhaust tips
- Bolt-on installation made easier with provided mounting hardware
- Designed to work with your GT's Active Exhaust system
- Proudly made here in the U.S.A.

*For 2018-2021 models only, this exhaust will NOT fit 2015-2017 models regardless of installed valance.

Flowmaster understands that you want something better than the boring stock exhaust your GT was originally equipped with, but you also don't want to wake up the neighbors or shake the vehicles beside you when you're stopped at lights, so this American Thunder axle-back exhaust is the perfect compromise! The moderately aggressive tones will be way better than your factory system and the larger 4" polished exhaust tips will provide your Mustang with just a bit of style and class! Flowmaster designed this exhaust kit to be a direct-fit upgrade and uses high-quality, mandrel-bent 409S stainless steel and superior 44Series mufflers to achieve maximum performance. You'll love the improved sound and the increase in attention you'll receive after installing this system, so what are you waiting for? Pick up your brand-new axle-back kit from CJ's today!

Please Note: This system is only designed for use with models that are equipped with the Active Exhaust Option from the factory.

Tech Tip: Installation requires cutting of the factory exhaust piping. Once the modifications have been made to the factory exhaust system, installation is a simple bolt-in procedure.

When you're looking for an exhaust for your favorite Mustang, every owner needs to check out Flowmaster's exhaust systems and mufflers. Flowmaster is a manufacturer of just about any part you need for your Mustang's exhaust, from full exhaust systems and exhaust kits to mufflers and accessories. CJ Pony Parts is proud to offer dozens of Flowmaster's premium exhaust products for your Mustang--browse around and place your order now!

Go ahead and purchase this upgraded Flowmaster 817799 3" Stainless Steel American Thunder Axle-Back Exhaust System with 4" Polished Quad Exhaust Tips for your new 2018-2021 GT Mustang with the Active Exhaust Option from CJ Pony Parts now!

California Residents: Proposition 65 Warning

Vehicle Fitment

This product will fit the following Mustang years:

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