I'm not aware of any notches on KW's for the M3.
In any case, tell your mechanic to take 'before' ride height measurements, and after installation, adjust the height collars to your desired ride height... typically 3/4 to 1" lowering.
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