Dude that TDI rocks hard. Looks really clean too.
I would relate the turbo to the retired woman. If I had to guess, she putted around in it, and like DZL said, coked up the VNT vanes.
One thing I would recommend that he didn't would be to go to dieselgeek.com and look at buying a racepipe. That eliminates the EGR valve so you dont have to worry about that and the intake clogging anymore.
Oh and go talk your buddy out of your old fat fives, and that thing will be one sharp ride.

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SMAUG - '98 UNI-RED NB TDI, UPSOLUTE, SPRINT 205's, EIBACHS, BILSTEIN HDs, CAT & MUFFLERECTOMY, .:R32 ARISTOS, GENERAL EXCLAIM UHPS, 250K AND CLIMBING