"The fitment of so called "plus one" and "plus two" and tyres is acceptable providing: etc etc"

Ok....but....

"In any event, rim width shall not exceed 177.8 mm (7") unless specified by the manufacturer as standard equipment for the vehicle in question. No increase in rim width is permitted for vehicles fitted with original equipment rims in excess of 177.8 mm (7") width. "



So, given wrx wheels are already 7" wide, going 17x7.5 or 18x7.5 will break DPI rules and thus void insurance?