I'm thinking of going Garrett GT-BB path with my RS4 (smaller sister of GT28RS - GT2560R aka GT28R S15 Spec R turbo). I can clearly see the possibility of sourcing all the parts for the project except for the software.
I can't find company that could make RS4 B5 Motronic software for Garrett GT turbos.
Also I have tried to contact MRC (Doug_S2 and Mihnea) many, many times with no success at all - thank You, guys!

I suppose, Garrett's are not so popular in Europe but there are many S4/RS4's being punished with big KKK turbos like RS6 and even K16.