To the best of my knowledge you cant do shit to the factory
ECu but i am probly going to be corrected, if u dont want to fork out for link/autronics/motec then things like ecutek 2 would be around 1800 fully tuned and that will be more than sufficient enought o give you loads more power and full effiency out of ur mods
Good Luck, please correct me if im wrong though, still learning
