Cool little toy.
Doesn't Generalelectronics offer a PC card for interfacing with the Botch Motronics CAN system?
I think it runs about $7,000 but at least you can tinker with the maps and the rest of the cars computer system. Sounds like fun!
Edit that first part, it's not GE it's National Electronics that has the CAN interface equipment. sorry brainfart! Here you go..
http://search.ni.com/nisearch/nisear...ter=true&q=CAN they might also have some free software for the hardware.