Only problem with a zetec swap is that you need more than just a motor. I looked at doing a zetec swap but it would have been very expensive to purchase basicly the whole front end of a zetec focus. And you still have a used motor with no warranty. Not to mention the keys, computer etc. ATK and Pep boys have both said that the new valve seats they use no longer have the problem of OE Ford SPI motors. Changing the motor out was a big enough job without all the hassles of aquiring and changing to a zetec. My new Pep Boys(ATK) is running like a charm and has about 2500 miles on it. I got 34 miles to the gallon on a trip to Nashville last month.