Right , Ive searched around abit obviously boost leak may be the answer however,
Driving home from work today was fine all well and good i was granny driving anyway. Then i got home and took my friend for a spin as he hadn't been in my s3 before.
On full boost i heard a noise that can only be described as a prelonged beep :S, It sounded almost electrical but quite high pitched :S.
It only does it under full boost just strikes me as odd . Any suggestions.