Two recent results in the field of BSM precision
calculations are reviewed: (1) For 3-loop calculations of the MSSM
Higgs mass, the problem of regularization is considered. It is
proven that regularization by
dimensional reduction is consistent with supersymmetry for such
calculations in the gaugeless limit. (2) The general 2-Higgs doublet
model and the muon (g-2) is considered. Constraints on the
possible values of
Yukawa couplings derived. It is then shown that the
current deviation in the muon (g-2) can be explained in a small
but interesting part of the 2-Higgs doublet model parameter space.