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2 main things come to mind: smog testing and noise laws.
Starting january 1st, 1976 first registration date, cars have to be smog tested yearly (variable intervals for cat and non-con-cat cars)
The 930 had a difficult time passing noise regulation when first homologated in Switzerland. Might be worth to check if there are any specific part numebrs for the exhaust setup.
Last thing to consider is the equipment that the swiss importer put on all imported cars, for instance the right side mirror, which was an option in Germany until late 80's. Rear wiper? Leather seats?
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