The buy-and-budget items: Magnetic Ride dampers (expensive if failed), intake-valve carbon (walnut blasting around 70-80k on the direct-injected 2.0T), and the timing belt/chain history (a recurring discussion point). Many cars are tuned, so confirm the tune can be reverted (OEM downpipe/flash) if you need to pass emissions.
Verify Magnetic Ride, carbon, timing, and tune reversibility
Audi TTS (8J) · buying-advice