Roush Active Axle-Back Exhaust Kit Without Active Exhaust GT 2018-2021



  • OE-Quality
  • T304 Stainless Steel
  • Mandrel Bends
  • High-Flow Mufflers
MSRP $2,964.00
You save $114.01

Roush Active Axle-Back Exhaust Kit for 2018, 2019, 2020 and 2021 GT Mustangs without the Active Exhaust Option.

Have you ever wished there was a way you could control and customize your 2018-2021 GT Mustang’s exhaust note? Maybe you wish you could keep it quiet as you’re driving through your neighborhood and then really let it go once you hit the highway? Or, better yet, have an exhaust note so loud that it’s not legal for street use and you can use it only at the track? Then get the best of all these worlds with this Roush Active Axle-Back Exhaust Kit from CJ Pony Parts! 

Features & Benefits:
- Allows You to Control Mustang’s Exhaust Note
- Uses Electronically Controlled Valves to Control Exhaust Note and Includes Console-Mounted Selector Switch with Brushed Aluminum Finish
- Selector Allows You to Seamlessly Switch between Four Different Pre-Set and Custom Modes
- Custom Programming Feature Through Included Wi-Fi OBD2 Interface to Roush Apple iOS Application
- iOS Application Allows You to Create Your Own Sound Profile for Custom Mode
- Allows Almost an Infinite Amount of Exhaust Tone Configurations: “Map” and Build Your Own
- Four Sound Profile Modes: Touring, Sport, Track and Custom
- OE-Quality Engineering and Construction to Ensure Long Life
- Made of Corrosion-Resistant T304 Stainless Steel and High-Flow Mandrel Bends
- Includes Dual High-Flow Mufflers and 4" T304 Stainless Steel Exhaust Tips
- Uses OEM Hangers and Mounting Points with No Welding Required for Installation
- Convenient Plug-and-Play Installation
- Includes All Necessary Wiring, Modules, Hardware and Installation Instructions 

This Roush (422100) Active Axle-Back Exhaust Kit allows you to easily control your Mustang’s exhaust note with the included console-mounted selector switch! This selector allows you to seamlessly switch between four different pre-set/custom modes: touring, sport, track and custom. This means you’ll have almost an infinite amount of exhaust note configurations, making it easy for you to “map” and build your own! This axle-back exhaust system is made of high-quality T304 stainless steel and includes dual high-flow mufflers, 4" T304 stainless steel exhaust tips, all necessary wiring, hardware and more. It’s just what you need to get that exhaust note you’ve always wanted when you want it!

Download the ROUSH Active Exhaust App for iOS

Touring Mode: Exhaust valves closed all the way. Keeps the exhaust volume at a neighbor-friendly note.

Sport Mode: Quiet during normal driving conditions and more aggressive under acceleration. Accelerator position and vehicle speed are used to determine valve position for a more aggressive sound.

Track Mode: Keeps the exhaust valves fully open with no restriction to the raw sound of your Mustang. This mode is not legal for street use and is intended for track use only.

Custom Mode: Gives you the power to create a custom sound map with our iOS application, personalizing the exhaust tone to fit your lifestyle. The Roush Active Exhaust app gives you full control over valve position based on RPM, vehicle speed and accelerator position.

Please Note: This exhaust is for 2018-2021 models only. It will not fit 2015-2017 models regardless of installed valance.

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.

Order a Roush (422100) Active Axle-Back Exhaust Kit for your 2018-2021 GT Mustang without the Active Exhaust Option from CJ Pony Parts today!

California Residents: Proposition 65 Warning

Installation Difficulty


Novice skill is required for this installation.

Vehicle Fitment

This product will fit the following Mustang years:

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