I think you might find it's a CV joint going, but my reasoning could be a bit of a stretch...
Many years ago I had a '67 Pontiac Laurentian, and it had a vibration in the steering wheel between the speeds of 55 and 65 mph, and at no other speed than that. I had no idea what was causing it until one day my rear (fortunately!) u-joint snapped. I went to Can-Ti and got another one and did the repair on the sidewalk right where the car died. I sure couldn't afford a tow truck back in those days. Anyway, after the repair the vibration was gone.
So like I said, comparing the u-joints of an old 60's car to the CV's of a much newer Porsche might be a bit of a stretch, but it wouldn't hurt to check them out.
Mark
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'99 black 986
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