Cat conversion at Scorpio 2,9 (Bj.94) possible or even only re-encryption urgently

Hello I would have a question for you again. I’m thinking about getting a Scorpio all-wheel (built in 94) for the winter, think about driving, is that ideal or? We here in the mountains have quite hard winters mostly, as now also just again. Since I am a Scorpio fan, like our family ( already own 4 pieces) the all-wheeler would be very irritable already. But now to the problem, where I think there is no solution. The all-wheeler has the 2.9 liter engine, as far as I know, there are for the My brother only drives the same model without four-wheels. As far as I know there is no way past the expensive taxes or? Or is there now a possibility e.g. a new cold running regulator or if one installs such a universal cat that one gets out of the stupid Euro 1? Please try to answer me quite quickly, because I have to decide on the weekend because of the car. Thanks already now.