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The ROUSH Active Exhaust upgrade kit converts an active-ready quad-tip ROUSH system into a full active exhaust for 2015–2023 Mustangs, allowing real-time control of tone and volume via an iOS app. The kit uses a valve system that adjusts exhaust flow, installs plug-and-play with no cutting or welding, and includes a four-mode selector knob with faceplate. It converts specific ROUSH active-ready quad-tip systems (part #421921 and #421923) to full active operation.
ROUSH 2015-2017 Ford Mustang ACTIVE Exhaust Upgrade Kit (Requires ACTIVE-READY Exhaust Kit)
