Hello dear community, I already read a lot in the forum for the V10 TDI, because I would like to buy one, is really a great car I have read several times about it that the V10 can be retrofitted with a soot particle filter and then also managed the Euro4 standard, have already seen such vehicles. Can you tell me where I can have the retrofitting and it is also so expertly recognized the VW. Also possible costs. I know of a VW handler who had a converted had it to stand, but had forgotten to ask at that time and was not the home. Would be great if you could help me further.