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Roush Active Exhaust Upgrade Kit (15-17 GT, EcoBoost)

Item 389793
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Market Price $1,699.99 You Save 1% ($15.00)
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$1,684.99 (kit)

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    Features & Details

    • ROUSH Active Exhaust Upgrade Kit
    • Converts Roush Passive Exhaust to Active Exhaust
    • Select Between Touring, Sport, Track and Custom Exhaust Notes
    • Custom Programming with Included WiFi OBD2 Interface and Roush iOS App
    • Compatible with Roush part numbers 421920, 421921421922 and 421923.
    • Fits 2015-2018 GT and EcoBoost Mustangs equipped with a Roush Passive Quad Tip Axle-Back
    Roush Active Exhaust Upgrade Kit. You already know that the Roush Quad Tip Passive Axle-Back Exhaust will add an aggressive, raspy growl to the sound of your Mustang's exhaust. But, do you sometimes feel that you are missing out because you didn't opt for the Roush Active Exhaust instead? Well don't worry because now you can convert your Passive Exhaust to an Active Exhaust with a Roush Active Exhaust Upgrade Kit.

    Total Control. Take total control of the volume and performance of your GT or EcoBoost Mustang with a Roush Active Exhaust Upgrade Kit. Roush's proprietary Active Exhaust system ties directly into your Mustang's powertrain control module, opening and closing the mufflers valving based on throttle position.

    Four Distinct Exhaust Sounds. The ROUSH Active Exhaust System includes a center console mounted selector knob that allows you to easily switch between four different sound modes on the fly. Choose from Touring, Sport, Track, and Custom.
    • Touring. The Touring mode closes the mufflers valves completely keeping the exhaust volume to an absolute minimum.
    • Sport. The Sport mode keeps the exhaust quiet during normal driving conditions. Accelerator position and vehicle speed are used to determine valve position, opening up under acceleration for a more aggressive sounding ride.
    • Track. The Track mode is wide-open. This mode keeps the exhaust tailpipe valves fully open at all times and doesn't restrict the raw sound of your Mustang. This mode is intended for track use and is not legal for street use.
    • Custom. The Custom mode lets you create a custom sound map with the included WiFi OBD2 interface and ROUSH iOS application to personalize the exhaust sound to your own tastes. With the app you gain full control over the position of the valves based on vehicle speed, rpm and accelerator position. Download the free ROUSH Active Exhaust App for iOS - Here
    Application. This Roush Active Exhaust Upgrade Kit is designed for use on 2015-2018 GT and EcoBoost Mustangs equipped with a Roush Quad Tip Axle-Back Passive Exhaust System - part numbers 421920, 421921, 421922 and 421923.

    Download the Roush active exhaust app instructions - Here

    Fitment: 2015 2016 2017 2018 2019 2020 Details

    MPN# 421926

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Flashed Controller, Active Exhaust
    • (1) Vehicle Ready Wiring Harness
    • (1) OBDII Active Exhaust Programmer
    • (1) Hardware Kit – Active Exhaust
    • (1) Switch, Mode Selector
    • (1) Switch Plate, Metal with Engraving
    • (1) Switch Bracket
    • (2) Bolt – M4 x 0.7 x 10
    • (2) Push Nut – 3/16” 
    • (3) Washer – M4 Nylon 
    • (7) Zip Tie with Edge Clip
    • (1) Knob, Knurled Style
    • (1) Set Screw – M3 x 0.5 x 6 
    • (1) J-Clip – M6  
    • (1) Bolt – M6 x 31 HEX
    • (2) Foam Tape 30 mm x 35 mm x 7.9 mm
    • (1) Micro Fuse – 10 AMP   
    • (20) Zip Tie – 7”  
    • (1) Multipurpose O-Ring, 5.6 mm
    Installation Info
    Tech Specs
    Will it fit my Mustang?

      Customer Photos (1) Submit Your Photo

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        Questions & Answers (3)

        3 Top Rated Questions

        Does the active exhaust kilt only work with the Roush Quad Tip Axle-Back. Or can you put it on a different exhaust.

        • This kit is designed to work with Mustangs that have the Roush Passive Quad Top Axle-Back installed. It may not work with other exhaust systems.

        Helpful (2)

        Will this kit work with the 2018 gt stock exhaust system?

        • Unfortunately it will not work with the factory exhaust. It is designed as an upgrade for 15-17 Mustang GT/EcoBoost models equipped with the Roush Passive Quad Tip Axle-Back which can be found here: 

        Helpful (0)

        Will this kit work on dual exhaust or only quad exhaust?

        • This kit is designed for 15-18 Mustang GT/EcoBoost models equipped with the Roush Passive Quad Tip Axle-Back exhaust. Unfortunately it will not work with a dual exhaust kit.

        Helpful (0)
        Post Your Question

          Customer Reviews (4) Write a Review

          Overall Rating 4

          out of 5 stars

          Installation Time:Afternoon

          • Loudness / Volume 5 5
          • Exhaust Note 5 5
          • Fit & Finish 5 5
          • Bang For Your Buck 5 5

          • 5/5

            Installation Time: Afternoon

            February 20, 2018

            Easy to Fit at home!

            Everything supplied, easy to follow instructions and the finished result is awesome!


            Year: 2017 Submodel: GT

            Helpful (10)

          • 1/5

            February 18, 2017

            Roush Active

            Returned Item. I liked the way my RS3 sounded, with all 4 exhaust tips active (uncapped). I actually added an X-Pipe, which deleted the "bread box" resonator, instead. Please note: Roush needs to make it clear that this Kit is for toning down the sound. Windows up, there's no problem listening to music or conversation. Save the $1600 , and enjoy the sound of your ROUSH Quad Tip Exhaust, as Jack Roush wanted it to sound (NOT muffled to please your H.O.A.)


            Year: 2016 Submodel: GT

            Helpful (12)

          • 5/5

            August 16, 2016

            Active Exhaust

            Having catless ARH with a ford racing x-pipe and a roush quad exhaust is an extremely loud set up, so I wanted something to tone it down when I needed or wanted to. The sound when its touring mode which is valves closed is just disappointing. I thought having a full system would make it sound little louder than stock but it sounds like a stock GT exhaust with something holding it back. I can explain it best buy saying its a raspy version of the stock GT exhaust that comes on the car from factory. The sport mode keeps values open when you start it and at idle but closes them at a higher RPM I believe 4500 but not positive as I never drive in this mode, again I don't like the sound it produces and thats probably bc of headers. One thing I didn't know is the system automatically defaults to this setting when you turn it off then on when your dial on the dash is set to track. When your dial is set to touring it won't go to sport it will stay in touring. This is bc track is "illegal" for street use. Then there is track mode, my favorite mode and one I keep it in 99 of the time. Open valves 100 of the time and music to my ears. The last mode is custom where you can create a custom exhaust map based on RPM/throttle and speed. This is really cool but I find myself not using it as much as I thought. I feel like most of us are the same in this regard from people I have talked to, when a car has all sorts of modes we keep it in one and barley use the rest. Thats how I feel about this system and I knew that when I was buying it. I got this system to have the ability to dial it down and for that it works great. Every mode works as advertised and the quality of the parts are fantastic. I would only recommend this to people having an extremely loud exhaust that needs the ability to quite it with a single dial.


            Year: 2015 Submodel: GT

            Helpful (10)

          • 5/5

            August 02, 2016

            Excellent product

            Pretty easy install process although I did have a local audio installer finish the job from the dash to completion. The active exhaust works well and is very useful for when I want to turn the volume down around my home. The custom tune feature is really cool too and I've had zero problems connecting to the app on my iPhone. Be sure to select Vlink as the wifi network. I used the exhaust system in open or track mode for about a week before having this installed. While I loved the loud aggressive sound there were times and places that I wished I could tune it down a bit. Definitely worth the money and would not want to go back to manual mode.


            Year: 2016 Submodel: GT

            Helpful (11)

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