Why does any water get in there in the first place with the sunroof closed? Isn't it like any other window that has a seal? When it pours sideways in a windy rainstorm you don't get water coming in through the windows...

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09 535xiT 6spd DSB/NB
06 M3 coupe 6spd SG/BLK
08 Nissan Frontier Crew
98 Jeep Wrangler
11 Honda Odyssey