Hi all. Not sure if this is the correct place to post my problem as this forum calls posts, (messages); Or have I got it all wrong? I have a 2000 S4. The car has no boost and it makes a whinning noise in stead of boosting. It is not a whooshing noise so there are no split pipes. (had one of those before). For what it's worth, I think one of turbos is not spinning, but how do i find out which one. Do you have to pull the engine out to get the turbos off ? Any help would be greatly appreciated. Thank you very much in advance.