Stillen's Brake Cooling Kit claimed:
"During testing the non-cooled rotors reached 600 degrees while the cooled side only reached 456 degrees. This is a temperature difference of over 140 degrees or 25%"
I prolly haven't benefitted drastically with a 3" diameter vs 2"/2.5" diameter air duct hose as there are limitations thru bends and the cross section are of the inlet, but anything is better than none with the stock 370z Akebono sports brake when tracked.