Its damned confusing.....400S or 2005? The owners manual that came with my 01'ZX3 was actually for a 00'. The 00' manual called for the 2005 in the DOHC but when I downloaded the 01' manual from Ford it calls for the 400S in both engines, what gives. A very good while back someone posted that the downloaded version was a misprint but guess what, its still there on the Ford site, think they might have changed it by now. Now absolutley zero high quality filter manufacturers make a 2005 filter however most of the big guys make a 400S filter, if the 2005 is for the Zetec and the 400S is for the SPI isn't that back asswards? I've been using the Pure1 PL20195 for 39K and am very happy with it, but will using that filter damage my engine in time?