I have been searching and searching and come across nothing so i joined up here to ask as i am a new owner of a S4.. my question is, I have heard installing a blow off valve in place of the diverter valve is harmful to the engine due to the fact that it was made with two smaller turbo's to deplete the need for it. so basically would my S4 benefit or be harmed by installing a bov? another question, what are common problems with S4's because since i bought it everyone is telling me they have a lot of problems, any truth to this? thanks guys!