  A study of outflow (OF) and BAL systems in Mrk 231 (and in similar IR QSOs)
is presented. This study is based mainly on 1D and 2D spectroscopy (obtained at
La Palma/WHT, HST, IUE, ESO/NTT, KPNO, APO and CASLEO observatories) plus HST
images. For Mrk 231 we report evidence that the extreme nuclear OF process has
at least 3 main components, which are probably associated with: (i) the radio
jet, at pc scale, and (ii(the extreme starburst at pc and kpc scale. This OF
has generate 4 or more concentric expanding bubbles and the BAL systems. The
variability of the short lived BAL-III system was studied. Finally, the IR
colour diagram and the UV BAL system of IR+OF+FeII QSOs are analysed. We
propose that the phase of young QSO is associated with:accretion of large
amount of gas (by the SMBH)+extreme starburst+extreme composite OFs/BALs.
