This is the first time I have seen this thread and I would like to add my input if you all don't mind...
There is a lot to consider when looking at brake ducting. Something like Modshack posted might look pretty ghetto but it will be functional. If you look at a lot of professional race cars they simply add little wicker bills on the lower control arms just to "scoop" some airflow into the brakes. This is one of the many things we did on our Ford GT rally car in fact. We just built little rubber blades and drilled them into the lower control arm and they worked very well.
If you want to make the front fascia fangs your airsource you would need to see what size tubing you can fit up there. For starters, 2.5 inch is the minimum of what you can consider to be "acceptable." Anything smaller than that and you might as well not bother.
Second, take a look at your routing. There is a lot going on back there and you need to route the hoses around coolers, chassis braces, and most likely you will need to cut a hole in the fender well to gain access.
We are going to work on an active cooling kit for our car. Basically I'm going to take the cooling kit that we make for the GT R and make it fit the Z. It isn't cheap but it is incredibly functional and has electric fans and everything...This will be for our race car.
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