Make sure it's properly scienced and not some scabbed together POS that takes into account the idle air control parts, fuel rails, and other *necessary* bits no one thinks about. Besure it will withstand the massive vaccuum that tends to collapse carbon faggot intakes. And besure to make it so it wont blow out the gaskets when it heaves under pressure.
Or you can just make a carbon faggot copy of the stock one and sell it to kids.