hey man i tried to pm you but your inbox is full!!!!!!! lol i will post my pm here
hey how's it going. so i checked out the s4, it looks clean like the owner took care of it. um the usual leaks are camshaft/camshaft adjuster seals, the coolant after run pump in the valley between the cyl' heads, and the output shaft seal for the differential. all the normal maint. looks like its been done, t-belt waterpump ect... that's good that's a 1500$ job at the dealer. check for water leaks around the A and C pillars for water stains, sometimes the sunroof drains leak but usually only if the car gets pine needles and leaves get in there. i noticed the front bumper is missing the headlight washer caps. no biggie though. i would recommend getting a fault scan if he or you can bring it to the dealer to get a complete fault scan that would be nice. the turbo's have been replaced that means the entire engine/subframe/tranny assembly has been out of the vehicle. at the dealer i work for we usually do a 1hr labor time inspection which includes fault scan batt test, ect... and a complete inspection inside and out and under the car, it may be worth the 100 bucks, ask if he took the car to a reputable shop, there are alot of hack shops out there. good luck with the car it looks real nice. we had 2 b5 s4's that were in on trade, one was blue with 54k and a black on black with 95k they were nice! too bad u aren't in washington or i would have helped you out more

if you have more questions hit me up.