I’m interested to see what you come up with.
Right now I just have some Allstar 3" flanges that I modified to bolt on to the caliper mounting bolts, with 3" tubing zip tied to the LCA. COVID has limited my track time to gauge effectiveness. I’m a bit skeptical that I’m scooping all that much air.
2-1/2" will probably be much easier to work with. I just couldn’t find a flange that would fit in the same spot as the Allstars.
Please take time for pictures along the way.