GTI TDI 150 ish.
Had a new Turbo fitted today , after seeking advice from Crasher at C and R.
And to my relief his diagnosis was spot on .

The car accelerates better from low revs and keeps pulling smoothly up to the red line. And even after an energetic road test i found the MPG to be much better also.
P.S I think i will order a Steinbuer and fix it myself , looked at the manuel on the web and it looks simple enough . Hope i don,t need to adjust the potentiometer . If i fit the isolating switch would this allow the engine to be read without unplugging the complete unit ?.
And yes i do know a map might be better.