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Mine has 17's lowered 45mm and it doesn't rub at all (apart from on full lock but thats doesn't count ).........its luck of the draw on these cars.
It also depends to the tyre wall profile quite a lot, I run Toyo Proxes which have quite a rounded wall. I used to have Falkens with a square tyre wall and they rubbed.
I have 7.5 X 17 RS7's on my s2. Lowered 25mm on PI shocks n springs. It catches with 3 up, on dips, otherwise ok.... I never have 3 in the car anyway so it dont bother me, I have had no work done to my arches. I helpful hint that I found out was to use spring assistors in the rear springs to raise the arse a little, helps on the bumps too, now it dont catch at all