the best standalone unit, as lucky said, is the PowerFC. for a less expensive option, you can get the Gredd e-Manage. it's a piggy back unit. C2 Power uses them in their turbo kits. as far as headers go, DC Sports headers show the best gains on a STOCK engine. however, when combined with a CAI and exhaust they show very little if any gains. your best bet is to stick with CAI and exhaust.