Before I found this forum my experience of the Gran Turismo games was nothing more than simply turning on the ps/ps2 and playing a few races. Now i see people talking about online leagues/races and changing the cars perfromance by swapping engines? What the hell is going on? As far as i know you cant play gran turismo over the internet so how does this work? How can you change the cars? Put the disk in a pc? HELP!