all depends on how careful you are with the clutch... I think most get 150-160bhp fairly easilly and I think some people have 1.9's running at 190bhp, but that may be with some extra "meddling"...
if yours is FWD and given the "lump of torque" delivery style of the TDI, there's probably no point if pushing much beyond that 150-160bhp...
Whatever you do, just remember to be careful with any traffic light grand-prix starts... clutch all the way out before the right foot hits the loud pedal properly.... and certainly no "launch control" style starts!!
The manufacturer's map detunes the lower revs so you don't have enough torque to burn out the clutch.... the remap removes that safety feature and leaves that in your hands.