as said jabba motorsport is up there with the best wen comes to VAG's my mate got an extra 50bhop from his s3 once mapped by jabba
try awesome gti as well. think they do revo.
don't forget apr do trial maps. Depending on where your based try awesome. Other than that jabbasport, p-torque offer good remaps.
For the golf pd150 I'd go custom and ask for the sensible torque amoun or say bye bye to your clutch/flywheel.
think you getting confused there as the pd engines are diesels not petrols
What sort of power/ torque does a remap give on a 150bhp 1.8t.
How does the compare to a 1*2?