This is one of the coolest things I have seen, it isn't a PC mod, but I didn't know where else to put it. The GT3 replica is powered entirely by foot and it is street legal!
http://www.hardware-360.com/group-o...mazing-pedal-powered-porsche-911-gt3-repilca/
http://www.hardware-360.com/group-o...mazing-pedal-powered-porsche-911-gt3-repilca/