Fubar1

I have a pd105 remapped to around 150 it was mapped with no proof but I can feel it's faster than a 105 , this may not come as a shock but the turbo is whistling like a prostitute in the wind ,it went dead with no power and it started sounding really wierd ,I've been told I will need a bigger turbo on if I want it fixed is this right Fault code P0234 turbo overboost condition still got 105 injectors BTW, tia👍