Try a late 60s model American Motors AMX and you might see where the XFire idea originated (or so I suspect).

A link - http://www.musclecarclub.com/musclec...amc-amx-1a.jpg

The AMX was a cool looking car during the day. If it had been built by one of the Big 3 U.S. automakers it liklely would have been a lights out smash with the public...but the American Motors tag really put the damper on in my mind.