Oh OK, yeah I don't think you can modify the 510 to send extra data. Maybe with vagcom perhaps but I don't know. I totally pulled my RNS2 from the car since the carpc replaced it. Yes with the arduino I'm using mcp2215/2251's. I originally brought a spark fun CANBUS shield then after looking at the schematic I built another one without the GPS, LCD and joystick to connect with my teensyduino.