Hi there, I am going to view a 1999 S4 avant on sat and could really do with some expert knowledge on what to look for when deciding to purchase. I have had a quick scan through the forums and have seen a few posts about the engine having to be removed to replace the turbos?, so what are the best ways to check turbo health when viewing? have owned many cars in the past with v6 engines and turbos but never a v6 twin turbo which i understand is a very durable engine? Also as far as modding goes what could one achieve with a simple remap and exhaust, filter modifacation? or is it not that simple? Any help would be greatly recieved as i am a bit in the dark about these classic motors. cheers matt.