Quote Originally Posted by White94RX View Post
There is an underbody panel that blocks the hole. There's no way leaves or water will get in there. And then there's this thing called gravity... Leaves or water won't go up a hole.

Edit: Your picture caption says to drill the hole through the underbody panel and rocker panel. I drill through the rocker panel only and not the underbody panel. This is as per BMW instructions from the bulletin. Hole in rocker only, and the underbody panel will still allow for drainage while protecting the hole from any outside factors.
UK service bulletin says to drill through both skirt and the under panel. Surely if you don’t do both it still won’t drain