A little up-date.
Have my brake ducts installed. The left side went real smooth. The right side is a pain because of the washer reservoir. It's in the way somewhat. I had to cut the duct at an angle some, so that the reducer could clear the reservoir. If you are planning this with a 4" hose. It ain't happening unless you remove the washer reservoir. If you want to see more pictures. Look in my journal.