Mariah Motorsports has a true NACA headlight cover intake. I have one in conjunction with their cold air intake box. I like the look of this one way more than the other ones I have seen. The quality is totally first class.
They are $149.00 and available for first and second gen.
There website won't let me link straight to the NACA cover page. Here is a link to their site though...
http://www.mariahmotorsports.com/