Some time ago I started making plans for what to do with my girlfriends 1.4 tdi polo. My plan was to get a lively but ultra economic city car. Now I have a gtb1749vk that needs an overhaul, but I think is too big for my intensions. So since it needs an overhaul I was thinking that at the same time it could be hydrided with a smaller compressor and maybe turbine. So hers my question, cold it be done and would there be problems with flow in the housing or…. ???