Soot particulate filters

I ordered a new Audi A3 8P from my Audi dealer and asked him what it looked like with regard to the two years tax exemption. He meant that the car would be tax-free until the end of next year and that the cards would then be remixed. Is that true?? On the other hand, I asked him for a soot particulate filter for my car and he meant that it would not exist yet and would not be necessary at all, since Audi would also have to use the Euro 4 standard without this F Is he right that the filter is not yet available?? UNd if there is already one, how expensive would this one be?? Can someone give me some answers??