First, did you SERIOUSLY try to circle that with black? come on. . you're smarter than that. :rolleyes
second. The carbon fiber ones you see are not just the duct cover. they were actually carbon fiber ducts that blended in to the fairing. on the F4i, those are just plastic covers, and getting them in carbon fiber will:
1) do nothing
2) be expensive
nobody would make them in real carbon fiber because if you're doing it to reduce weight, you should just take them off. If you're doing it for look, fake cf will look silly (it always does. . It was only cool when we were 16) there might be a CF airbox out there for ya, but I wouldnt spend too much time looking.