They are in direct contact All the heat transfer is through convection.

FWIW, I'm using Carbotech XP8's and Motul fluid, and have no issues with either one - they're fantastic. My dust shields are removed, but I am cracking rotors at a pretty quick rate (I get 2-3 weekends before they crack all the way through). I've been looking into duct options, but its just so hard to fit anything that will pull air to the center of the rotor on these cars.

I dont think the Dali racing ducts as pictured will be able to fit around the hub - with the axle there, there's just not much room. They have a listing on their website for CF ducts for ITR - http://daliracing.com/v666-5/catalog...cfm?focus=1441 - but when I emailed a while ago they said they had supplier issues and had no idea when those would be in.