Square setup will significantly reduce the inherent understeer in the 135i. The point on reducing the rear tire size is a valid point. I'm opting for 235/40 and 245/35 to try and minimize the understeer without sacrificing rear end traction.
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'07 Z4MR '22 GT4 '18 GT3 '16 GT4, '16 M2, '14 X1, '13 135is, '06 330i, '03 323 Ci, '01 330i, '99 M3 (RIP), '96 318is, some non-BMWs
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