I'm selling my tuning box purchased from racechip.de a couple of years ago. It is the mid option box with adjustable boost and duration of boost. I'm sure I still have the original manual packed away for it too. Still works fine and comes with the correct cable.
It may work on the 1.9 mjet but you would need to contact racechip to ask before, if not they do offer a reprogramme service.
When purchased racechip quoted a 30bhp increase and 75nm increase and you can tell a big difference even with the boost settings on a low setting.
Open to offers