03maxsiny

Hey all, im running a pretty much stock 2003 GLE except for a drop in K&N, and i have decided to do the GAB mod. I did it, and i love the sound its making now, and there is a noticeable increase in power all around. I just have a few questions about the pros/cons about this mod. After running with it for a while, (1 day) i noticed that the filter got pretty dirty (black)... is this normal, and is it ok to leave it like this? Also, what are the chances of the filter slipping out of the hangar? Any other input or pros/cons is appreciated. thanks in advance.