if your going to knob about with your ecu yourself you have to accsept the possoblity you may blow it up while your learning. if you don't mind the possoblity that you may blow it up CRACK ON, if your worried about blowing it up i suggest you don't
simpels really
may intrest you tho at work were thinking of making a large chunk of our map libary freely avalible on the net, but not just the data file thats uploaded all the infomaton that goes with it like all the diffrenes from the std file documented and all the live data recorded from the dyno. likely be everything pre mk6