The leak DOES sound like its coming from right behind the guages. I initially thought it was from the passenger side, but it seemed to be more centre. When I turn the car off, I hear a more high-pitched wooshing sound as the engine cuts. This sounds like its from the top of throttle body, or behind the guages against the firewall. Ive checked all visible hoses around the throttle body and none have come off. It might be a split, but I wouldnt think a small split would make such a loud noise. Certainly sounds like an entire hose has come off the noise is that noticeable.