Greens cannot be put on the fiesta rs turbo management due to the impenece difference on the injectors. the ecu will not control these. Bieges are a very common choice amongst alot people however if you have any plans on running anything over one bar of boost bieges just will not work. It will run mega lean on boost. The best thing to do is get a customised chip through msd and ask advice on injectors normally magnetti are a good choice. However ask their advice. you will be looking at a good £700 on a custom chip, set up at msd and injectors but it will be done right.