Hi guys, i've been checking these forums for a while know as i have recently purchased an s4 with 25000 miles on the clock. It sounds too good to be true I picked it up for very cheap and am slightly suspicious as it has had two owners since new, meaning it was kept for less than 15000 miles by each owner. The alloys are scratched quite badly but the dealer said he would recondition them. I read that scratched alloys are a sign of bad driving. Also the rubber trim on the windows doesn't line up for the front and back passenger doors, its probably off by a few millimetres but its noticable if you look closely. The door panels seem fine. HPI check was clear, no acccidents etc so the next thing i want done is an inspection of the engine by an audi specialist just to make sure the engine is not on its last legs (it doesnt fell like it is though) Thing is i want an honest opinion and was wandering if any of you guys could suggest a good specialist that knows about their s4. Also thinking about a small performance increase but am worried about invalidating my 3 warranty. I keep hearing the name AMD? PS Do i have to leave the engine running for afew minutes b4 turning it off to cool the turbos or is that all taken care of.