What kind of power loss are you experiencing? Also, it comes to mind that
you should have your turbo VAG-COMed in case it's one of those naughty
diverter valves or Magnetventils. Then again make sure all the plumbing and
especially the turbo intake pipe-manifold are OK.
If it's the turbo that's gone to pot, you might hear some loud hissing at
irregular intervals when it's under load. I would suggest listening for that
on both the Folks and the Audi with windows down, radio and vent off in a
quiet, preferably narrow street uphill with walls on both sides that would
echo and amplify the sound they make in second or third gear.
My two sounds, I mean cents,
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