This looks very promising. It is an Arduino unit which connects to the vehicle and can sniff and inject into the CANbus. Change one thing and find out what the ID is and maybe change it on the fly?
http://jalopnik.com/theres-finally-an-affordable-plug-and-play-car-hacking-1792915832
Project website: http://macchina.cc/
Kickstarter: https://www.kickstarter.com/projects/1029808658/macchina-the-ultimate-tool-for-taking-control-of-y
http://jalopnik.com/theres-finally-an-affordable-plug-and-play-car-hacking-1792915832
Project website: http://macchina.cc/
Kickstarter: https://www.kickstarter.com/projects/1029808658/macchina-the-ultimate-tool-for-taking-control-of-y