Welcome to Offipalsta and to Finland. On high level you can increase tire size by 2" compared to the biggest ones from Factory. Also you can lift suspension with 3" and body with 3". Total height change must not exceed 150 mm.
Normal trick is to have small tires for yearly inspection and switch the big ones back after the inspection is completed. Then the remaining 364 days a year you just have to hope police won't stop you and give a ticket because of illegal tires.
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