When your suspension is compressed (i.e. lowering your car) the geometry changes, which would mess up the toe of the wheels. Also due to variation, two identical springs may have different heights, spring rates, etc, so the camber on left and right may not become exactly the same.
2011 E92 M3 DCT
1991 Spec Miata
2008 E92 M3 DCT - KW Competition 2-way / Brembo 365 BBK / OMP ARS racing seats / rear seats delete / GT4 aero / AiM EVO4 data logger / SmartyCam racing camera
2008 E92 M3 6MT
2008 E92 335xi