This is the first I've seen of the spoiler air ports actually being connected to the front brakes for cooling. Is it a custom (cobbled up) affair or is there a bracket on the calipers that comes with the Willwood setup? Has anybody done this for a stock disk brake set up?
Unless you're tracking a car, brake cooling doesn't seem too advantageous, but surely doesn't hurt (unless it's pouring ran and a ton of water gets on your brakes, defeating the purpose).
Any flexible hosing can be used.