Bimmerwold told me same thing Gt4 race car has same front upright like street car buy all lower control arms are short and different plus on those wheels you need to run 32mm spacer up front.
GTS has revised CNC upright with more camber .
I run square 285/35R18 PS4S because Michelin don't make PS4S in 18" size.
My f80 has full GTS suspension and I don't run any spacer up front
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