Congrats on the purchase. Any mods on the car? This might sound pessimistic, but if the car is stock, go over all of the bolts holding the turbo on, IC brackets, etc to see whether the car was ever modified in the past. I dont know too many people that have gotten completely unmolested WRXs, most guys buy them and then start digging around and find bolts not torqued to spec or ECU jumpers on the OBDII plug.

If you've got any questions get on WRXatlanta.