no Y-adapter for the factory navi it's a RGB adapter about $250 -$500 avelectronics sells the module that adds a video input to the factory navi. I used a pioneer GEX-P7000 tv unit modded to work on the factory navi it adds TV tuner ,2 video input and a rear output for headrest screens and video switcher and a RF modulater for audio. it runs for $100-$250 on fleebay but you need sone electronic experience to do this mod or you can damage the navi. where the AVelectronic one is plug and play!