Noticed this problem when it rains. Upon starting the car after a night of rain, I can immediately hear a swooshing noise coming from the passenger footwell region. Then when I set off as soon as I engage the cluth it's like you can really hear the turbo wooshing up as though there's a massive gaping hole into the engine bay (obviously there isn't) and a load of water gushes down ffrom under the dash somewhere. It dribbles some more out for 30 seconds and that's your lot. My mate says he knows what it is, the cabin filter seal or something like that. He fixed it, resealed it etc only it's made no difference at all. Still doing it. Sounds like air con or something because of the noise it makes when it spurts this water out. Any clue somebody???