Help with S4

As my eclipse lies on her deathbead, the time has come to get a new car and I am considering an Audi S4. What are some things I should look out for when purchasing one? It will have to be a used one (2000 or 2001) What kind of perfomance do they deliver (0-60, 1/4 mile) and what kind of mods are there.....thanks alot

Service history is a must for these cars as it can be very expensive to fix if they go wrong. The worlds your oyster when it come to tuning as you can get these babies up to over 500hp if you have the money.

the s4 stock with its turbos has 250whp it runs 0-60 in 5.9 seconds