I drive this car on the street mostly and didn't want to run full ducts with backing plates. My approach was a little more conservative and took cues from the E36/46 M's.
Parts used were Apex inlet, some Jegs brake ducting, and Allstar flanges.
One of the holes of the flange was reused from the existing screw/clip nut.
I did not have to remove the splash shield, but did have it on a lift and didn't have the front tires on. In addition, I pulled the stock backing plates away from the rotor.