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
'14 Fiesta ST
200HP / 263 TQ
SCT Tune & Injen Intake, MBRP Catback
Moderator: Third Generation Ford Focus, DURATEC Ti-VCT GDI Performance Chat & Florida regional section