Hello, have a camper (VW T3, gasoline with 2.1l capacity), which in three years could get an H-mark, because it then cracked the 30 years. Condition is great and all original. Since the good piece costs me but over 420 Euro taxes, because the pollutant class is zero (no available/forgiven), I am just counting on what could be worthwhile until then. Season mark is NOT in question. Does anyone know if it is with current retrofitting of a cat (if technically possible However, in three years’ time, MIT Kat will still be able to comply with the regulations for granting an H-mark, or is this a technical intervention that will prevent me from doing so, because it is no longer the original technical condition!? Please not only conjectures, gladly supporting documents or sources for it. I would like to thank you and wish you a nice weekend!