It's not that wrong of a section... If the title was WTB: Cold Air Intake it would almost be OK.
Anyway, there's 2 main types so far as I can tell. CIAs (as you mentioned) and SRIs (Short Ram Intakes).
...Actually, I could blab a bunch about stuff I don't really know much about, but you're better off checking out the 3/MS3 Engine, Transmission & Drivetrain forum.
