Front is quite simple. Just drop the reinforcement plate and the bushings and you are done. The rears... don't do it. You don't want to mess with factory aligned suspension subframe just for a sway bar...
If you really want to do it, make sure a good, certified body shop aligns the subframe for you.
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