Roush Active Exhaust Upgrade Kit

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, 421921, 421922 and 421923.
Fits 2015-2018 GT and EcoBoost Mustangs equipped with a Roush Passive Quad Tip Axle-Back