years ago, i had a similar problem w/ my VW GTI's. after a rain storm, behind both passenger seats, the floor would be wet. took it to a sho and they could not find anything wrong. so, home i went. i started poking around and found that the sunroof drain tube running down the passenger side was pinched between the door and the body of the car. when i re-routed the drain tube, no more puddles.

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