This is the same pic posted earlier in this thread. I am going to attempt this on my Nismo.
I decided to go with the revotec 4" (102mm) circular air inlets connecting to the Stillen brake cooling kit. I'll obviously need a 4 to 2 reducer as well. The inlets were about $50 and the Stillen kit is approx $235. I'll let you know how it goes.
Revotec Air Inlets:
Revotec Automotive Cooling Specialists