Key thing on an early V8 is knowing with 1,000% certainty that the timing belt, tensioners, water pump and thermostat have been changed on time/miles - 5 years or 80,000 miles, whichever comes first.
You'll have to do your own kms conversion!
With a 2003 car that means it should have been done twice by now.
If the belt breaks the engine is toast.
Do read the buying a used Touareg thread - the link is in my signature below. You will learn a lot and probably save money too.