to add to the list of things to check- just like any sports car; check the back of the rear wheel arches for rubber. If you find small flecks of rubber deposits in there, good chance it has seen a few burnouts. Run your fingers from the rotor hub to the outer edge. If there are plenty of ridges and a big lip on the top, they have seen some hard stops (meaning hard driving all round).

One check I have found worth it's weight in gold with the turbo is to check the clamps holding the various bits of the piping together, hot and cold side. A leak on the hot side will mean the turbo is having to spin faster to reach boost. Over time this can shorten the lifespan.

If you drive it make sure it spools nice and smooth at low, half and full throttle. Give engine a decent rev to get turbine spinning before shutdown. When you key off, pop bonnet and race around the front. You should be able to barely hear the turbo spinning down. If it is loud and grindy, maybe you look elsewhere.

Make sure oil has been meticulous. Dirty long haul oil can kill turbo bearings, especially in conjunction with hard driving before stopping.