What model car. it's a BF xr6 turbo late 06 Is it tuned. Completely stock When did it start. 2 months ago "Puffing" is pretty vague. Like a trian on speed and not very loud though, I can only hear it when I have my window down as well and gets a bit loud when boost Increases Does it lose power when it starts doing the noise ? no.. not that I have noticed it still ramps up to 6 psi then bleeds off to 4.5 I will try do a video, I have incar sony cam but you can't hear the noise. Thanks for the replys.