No turbo related issues with my car and that had been at
400 hp for over 70,000 miles, it's now done 137,000 miles
and runs like a dream.
If you get a tt that's been looked after and carry on looking
after it it'll go on for a long time.
The trouble here is if it's been miss treated by a previous
owner/s, it might not show up for a while and is very hard
to tell, there are UK specs running the original turbos well
into 150,000 + miles and one i've heard of is over 200,000
The NA will still have lots of the same problems a tt will have,
heater matrix & radiators fall apart with age, brake lines and
calipers will be on the verge of needing replacing, suspension
arms and dampers etc etc.
I spent more on replacing the suspension arms than most
NA's sell for so bare that in mind, a supra is not a cheap car
to keep on the rd these days unless you run it via ebay or
the breakers yards
Whatever you buy it will be between 11 and 20 years old !!!