This might help give you a better idea of how our Sakhir M4 sits with the BC Racing coilovers. Here are two F80 M3s we have in for upgrades and our Sakhir M4 all side-by-side to compare the suspension options and ride heights these cars have.
Keep in mind, we are still experimenting with different settings and height adjustments.
MW F80 M3 - Stock suspension and no spacers (for now).
SO F82 M4 - BC Racing Coil Overs (prototype setup).
AY F80 M3 - H&R Sport Springs (F80 Specific) with 15mm spacers all around.
