Carbon Fiber should be about $300 each and match factory originals
That would be a good option. I plan on having the first of my aluminum vents in about 3 weeks - will post pictures as soon as available. The CF would be good for those (BONY) that get CF wood.
I would be a player on some aluminum vents if you can get them close enough to spec. The original vents have a nasty little arch to them that I would imagine is hard to replicate on a CNC machine.
The ones I am doing will be close enough to OEM that they will look like they should. Originally had ideas for various types of modified vents (see earlier posts), but there did not seem to be much interest in those.
The new ones will be cast - the CNC seemed to be prohibitively expensive (as jtedm89 indicted) due to curves, cutting louvers, etc. Will be available either powder coated the black of the grills so maybe no painting needed, or left bare aluminum for those that want to paint.
And just as a teaser, I also have another small item in the works that some of you will like. More on that to come.