INSTALLATION & FOOTNOTES !!! [ See pull-down menu below for reference ] BMW Compatibility & Notes: 7-Series with i-Drive Professional . Dual i-Drive Radios are *NOT* compatible. Additional BMW radios are compatible if losing text capability and/or the factory CD changer are not an issue Mercedes Benz Compatibility & Notes: * 2004-Up C & CLS Class with COMAND systems are *NOT* compatible. These vehicles must use the GW51MO2 * 2005-Up B, CL, CLK, G, GL, M & R Class with COMAND are *NOT* compatible. These vehicles must use the GW51MO2 * 2003-Up E Class with COMMAND are *NOT* compatible. These vehicles must use the GW51MO2 Porsche Radio compatibility & Notes Compatible with CDR23/24. Not compatible with "Text Compatible" radios such as the PCM1, 2, 2.1, 3. Text radios require the GW51MO2 CD-Changer option needs to be coded if no factory CD-Changer available Saab Compatibility & Notes 2003-2006 9-3 - Head unit must have front or rear CD changer support. Not compatible with Color/Monochrome displays or Navigation radios. These vehicles must use the GW51MO2