I am suffering from a ghostly whirring noise as i accelerate!! The noise seems to appear the same time as the turbo kicks in, but only with a more heavier acceleration. The sound is worse when the car is cold and easies off after five minutes of driving, but doesnt disappear! If i drive the car and let the turbo come in gently, i dont get the noise. The harder i accelerate, the louder the noise gets. To me it sounds like a split in a pipe. I have checked all visible pipes but have found no splits as such. I also feel im starting to lose a little power and not getting as much pull. Could this be a split in a pipe or something worse?? A little help on this would be well appreciated.