I am long-time owner of a 405 TD Kombi Bj. 91, still without a cat. Unfortunately, there will soon be the green environmental badge in my city. Therefore my question to all experts: is it possible to install the 406 HDI diesel engine into my old sweetheart? I have read something like this in forums from England. Yes, of course it is completely uninteresting economically, but I hang on to the old box.