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Although this says its for 2005 and up focus', I installed it on my 2004 2.3 PZEV focus today and it fit and worked fine. Great product, a little on the pricey side for what it is, but given the alternative its a great product.
I have yet to install this unit however, when using the K&N 33-2113 filter, I found it necessary to install the filter retainer with grove facing inward as opposed to outward as directed via the instructions. As a result, I decided to install the filter assy. with the retainer facing the inlet side.
Later that day I installed the unit on my 2005 Focus with the PZEV 2.0 engine. It was a truly frustrating procedure however, everything lined up correctly and I didn't have any parts left over when completed. Happy to have this in the rear view mirror.