i understand that there is about 60kw loss thru car drivetrain and dyno. (at least that has been the quoted figure from SK and other smarter people here over the years)
if 189kw is the factory quoted power figure then 130rwkw would be a fair number on the dyno allowing for age of the car, the fuel and any other variables like dirty afm's, airfilters etc might knock the number down some.
so 125rwkw seems a reasonable number if losses are 60kw.
if the losses are a little less then 130-140rwkw sounds fair too.