I'm curious how you're considering a turbosystem over there. I was under the impression TÜV compliance was mandatory and hard to get for mods (read: expensive). So much so that my Mitsu-Fruende buddies told me they don't even want to risk installing boost controllers on their Di-D CY0 Lancers.
Speaking of Mitsu-Fruende, are you on Mitsu-Talk.de? Good people there!