"Dentist drill means dying turbos. Look, if you have to ask if you have the dentist drill, YOU DON'T HAVE IT! It sounds like 1000 screaming babies in your engine baby. Siren noise also means dying turbos. Does chipping them, making them work at 200% of their designed capacity, make them die faster? Of course not."

Following up on your statement above. I just purchased my 2001.5 S4 w/53k miles a month ago. I do hear the turbos spooling up, especially when the engine is cold, slightly when temp is normal. Is this a sign of trouble ahead, or is some spooling sound normal??