you need the right wheel bolts you cant use the tapered bolts that your steels use you need flat ones
and if your car is unlowered it'll be fine even lowered im sure it'll be fine. tom5190 ran 165 tires on teh back of his when he was down 60mm instead of the 185s
he only had to cut away some of the arch when he ran 15" alloys with 195's
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