Generally for the B5.5 Passat of that age, your mate should check the suspension, the front control arms and CV boots may need renewal.
Am not familiar with the V6 engine, some bros here should be able to chime in.
Not sure what the noise from the rear can be as the car is generally well built, and do not usually develop loud noises. If the car is a 4-motion, it may be the rear suspension components.
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