Maybe you can order some of the Naca ducts they sell for race cars.
Here is a nose vent I made for my 300ZXTT. It is stainless steel mesh I bought from mcmaster-carr and expoxied in back of some holes I cut. My air intakes are right under the vents and my friend made a carbon fiber heat shield to block heat from the radiator.
Here are some carbon hood vents that Brian Kono from Afterhours Automotive made for the hood of my time attack car. He could probably make something cheaper than the JDM ones.
Carbon trix has carbon NACA ducts.
http://www.carbontrix.com/mitsubishi.htm
Scroll down to the bottom of the page. I used these on my turbo sentra se-r a long time ago.