Nitrogen

Hello all, during a tuningsession we found out my turbo is giving up (7.5R variant, at only 100k km) The car was completely stock, I mounted a Bull x 200cell downpipe 2 weeks before the tune, but now I guess I'll be needing a new turbo. I'm aiming for about 450/475 hp to keep the rest of the car reliable. (I already had to change a dq381 after the screws of the internal oil pump came loose and f****d up the dsg so it's been kind of a money pit) What can you guys recommend? I'm based in the Netherlands, Europe so it would be nice to get some recommendations that are readily available over here. I used the search function, but couldn't really find any useable info. Thanks in advance for your reply, kind regards