I have some kind of hissing noise coming from my 2.7T in the engine compartment. It sounds like if you put your hand right up against your mouth and blow hard, its pretty loud and thats the sound it makes. I don't notice it when just driving normal, its starts when I need to kinda get on it like trying to pass another car or just stomping on the gas pedal. I can't say I don't see any difference with the car as far as power or anything, seems the same to me even though my wife drives it everyday. Has anybody had this problem? Does it sound like some kind of vacuum leak?

 

like your leaking boost

 

is that fixable or a sign of turbo failure?