Riot, Seibon is an off brand and their parts don't even come clear coated, you have to do that yourself. They will yellow just as all CF hoods will.
Careful OP. CF hoods are a lot of maintenance. They yellow and wear. And you're going to have to add the cost of clear coating to whatever you get (some come with it already done, but for the sake of upkeep you want it professionally redone before installation.
knobbywrx, the stock hood is aluminum, and actually slightly lighter than most of the faux carbon fiber hoods on the market.