I've made & installed my own awhile ago, I'm glad to see that a vendor is providing these for the track enthusiasts. Nicely done!
Two vexing issues I've encountered during my installation were:
1. routing the ductwork around the undertray suspension cables and oil cooler lines
2. the exit hole in the inner fender liner
If you guys want me to, I can post a link to my installation, who knows it may help a few people with their own installs.
I think I'll order a set to replace my home-brewed ones but only after I see how the ducts are routed with this new setup.