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I've done the RS3 in 285/35-18 all around on 18x10 ET25. Fine in back obviously and I doubt the RS4 would be different but up front it rubbed a lot. I'd expect the RS4 to be worse as I believe the RS4 285 is wider.
Camber doesn't help, as it mainly hits the rear fender liner with the outer tread blocks at about 4 o'clock on the tire if you're looking at it from the side, so tipping the tire over doesn't give you any additional clearance there
So, doable, but your fender liners will take a beating
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