Good info, I just picked up my IX and this is some nice little background on the car that you don't really get at the dealer.
To add to this, (and if I'm wrong will a mod please edit it) I have red that one of the first things you should do is a boost leak test, as the cars may come from the factory without all the clamps tightened enough and as always who the hell knows with a used car

. Maybe some free ponies that weren't there during the test drive

.