I previously posted about a problem where the passenger side floor got soaked in our montero during a rain, with no obvious leaks in windows or doors or sunroof. We finally resolved the problem, it was a poorly sealed after market windshield.(we bought the car used, one year old with about 8000 miles on it.) On the bright side, the mitshubishi dealership we bought it from quickly replaced the windshield for us.
-bob