The Axxess AX-PO90052 is a premium Porsche radio replacement interface designed to retain the factory MOST25 amplified audio system and steering wheel controls when installing an aftermarket radio in select Porsche vehicles. Key Features Retains Porsche MOST25 factory amplifier Retains steering wheel controls Provides accessory power output Retains R.A.P. (Retained Accessory Power) Provides navigation outputs: Reverse Parking brake Speed sense Micro-USB updateable Designed for amplified Porsche systems Plug-and-play style integration harnesses included Compatible Vehicles Porsche 911 (997) 2005–2009 Porsche Boxster (987) 2004–2009 Porsche Cayman (987c) 2004–2009 Compatible with factory amplified MOST25 systems including Bose-equipped vehicles.