Hi Rudy, I'm confused. I have 2006 Roadster with Factory Infinity Radio w/NAV and wanting to play my mp3 player into the system as I don't own an Ipod. Are you simply bulk purchasing these units from a German Company SOLISTO and then reselling here in the US or have you developed the box with them? Your initial posts sounded as if you were building these units. Looking on the site Home | Solisto I see they offer a Solisto Pro, clasic and basic model in addition to a single cable connector allowing direct mp3 player connection to the radio for about $20.00 with player control manually not using the Radio buttons. Have you tried this cable and do you bulk purchase them as well for savings. I was going to order direct from SOLISTO but not sure if the cable works with the Infinity Radio. Any help would be appreciated.