yes i can mildly retune factory ecu. but i havent delt with it much.
i can do mines ecu, apexi power fc, nismo, motec, autronic, wolf, michrotec, and many more. from mild to wild depending on your setup. and what u wish to get frome your car and in performance and what u wish to do with your car as a everyday driver to a weekend thing but as to tune most ecu's yes i can do...