Updated!!!
This problem having my carpet mats flooded everytime it's raining seemed to be solved
for me. After several time looked @ what some folks suggested above to clean
the top front corner hole in the sunroof. However, one of mine were clogged
with some debris coming from the trees, and as we all know it's been
raining alot for the last couples days. Every since cleaned, I've not noticed
any flooded carpet yet.

(01 X5 4.4i)