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2018-2021 Mustang 5.0L V8 ROUSH Active Exhaust Kit

Part #: 422100

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Application: Mustang 2018-2021
Installation Difficulty:
Intermediate ?
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International Purchases & Shipping

Prices stated here are only for sales within the continental United States and ordered via the web site. Prices for other territories and countries may vary due to shipping fees, duties, and other factors.

Orders placed via can only be shipped to areas within the continental U.S. If you live outside the U.S., please orders must be placed through an authorized ROUSH dealer.

Product highlights for the 2018-2021 Mustang 5.0L V8 ROUSH Active Exhaust Kit:

  • Fits 2018-2021 Mustang 5.0L V8 GT - Convertible and Fastback
  • OE-quality engineering and construction for long life
  • Forged From Corrosion-resistant 304 stainless steel
  • Dual high-flow mufflers
  • 4-inch 304 Stainless Steel tips
  • Full mandrel bending
  • Uses OEM hangers and mounting points
  • No welding required
  • Touring, Sport, Track, and Custom settings for 4 exhaust "systems" out of the box
  • Custom programming feature through included WiFi OBD2 interface to ROUSH Apple iOS application
  • Allows nearly infinite exhaust tone configurations. "Map" and build your own exhaust note!
  • Brushed aluminum console-mounted 4-mode selector switch
  • Convenient plug-and-play installation
  • Includes all necessary wiring, modules, hardware, and instructions

Take control of your Mustang’s exhaust note, and enjoy that V8 rumble any way you desire.

With dual high-flow mufflers, corrosion-resistant T-304 stainless steel and high-flow mandrel bends, our patented ROUSH Active Exhaust system uses electronically controlled valves to control your exhaust note and make your Mustang stand out from the crowd. The included console-mounted selector switch has a brushed aluminum finish, and seamlessly switches between four different preset and custom modes. Our Active Exhaust application for iOS allows you to create your own sound profile for custom mode.

Download the ROUSH Active Exhaust App for iOS

Download instructions for the Active Exhaust app

The ROUSH Active Exhaust system features four modes: TOURING, SPORT, TRACK, and CUSTOM.

TOURING mode with the exhaust valves closed all the way, keeps the exhaust volume at a neighbor-friendly note.

SPORT mode is 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.

WARNING: Cancer and Reproductive Harm -
Application Mustang 2018-2021
Difficulty Intermediate
Time 4 hours and 30 minutes
Tools Garage Tools
Instruction URL Download Instruction Manual