On my Zetec, I ran two intakes. First was an AEM CAI and then replaced that with the Focus central intake.
This was years ago though lol
Dyno numbers: 177hp/163tq
Mods: Steeda Intake, STS Kit, Rear sway bar, Lowering springs, Steeda RMM, F2 Header, Magnaflow catback, SCT Tune
Moderator: Third Generation Ford Focus, DURATEC Ti-VCT GDI Performance Chat & Florida regional section