This is a cable that I am using with my Lancer Evolution race car : http://www.tactrix.com/

I am inclined to believe that Carman can read OBD-II output from this cable if someone is able to provide specifications of the appropriate protocol.

The guys in the Aktivematrix forum (http://www.aktivematrix.com/) might be able to help on this count. From what I understand, these cables are generic ODB-II cables with an additional connector for accessing and editing the flash ROM portions of the ECU for tuning purposes.