Update... Things didn't go as planned. They're is just not enough space to route a 3 in duct down to the bottom, one of the biggest problem I ran into was the damn brake fluid resevoir. I think a bracket relocation would help, but I didn't have one on hand.
I might try a 2.5 in duct on my next attempt. Also Filter size down below is also limited with an upgraded FMIC. I suggest no bigger than the Burger DCI sized filter if you have a bigger FMIC. Also if your running a BOV that's right next to the box you might not be able to do this.
As of now this is how I have it routed, I will try again and plan this alot better now that I know what dimensions I'm dealing with, and get this danm Mr.5 intake installed. Our cars are so limited in space compared to the 335i.
