Hello, I own a Canadian 1984 BMW 733i, i.e. the USA version, which was originally equipped with a 3-way catalyst. Here you can see how this was built up:http://en.bmwfans.info/…/ The old exhaust system is rusted away, so I had an adapted but not original one installed 2 years ago. The original parts were not to be found. I simply relied on the workshop, but at some point I noticed that there was no Katalysato r is more. Maybe the old one was rusty, but they didn’t say anything either. In any case, no one is there anymore. In Canada, no one cares about this, but even if there are still a few construction sites, I would like to take the car with me when moving to Germany in the fall. But if the Tuev knows that the car had a cat, he will tell it. And even if he takes the German version without Kat as a reference, I don’t get a green environmental badge, if the So a new cat has to be installed. Now the question is what do you do there? I have a few pictures attached to it, the pipes are about 46mm thick. I only read everywhere that Universalkats are Muell, but what else should you install there? Or do I have to adjust myself to the fact that the exhaust system has to be completely re-made again? Thank you already, Michael