Originally Posted by rambleon84
the focus received a mid gen update in 2005, after that point all north american focus's would have been switched to using the 2.0 duratec (or 2.3l for the ST)
Here are some duratec related threads you can read over:
The wiki page at the very top is pretty informative
Wow...thanks for posting this link...now I have some reading ahead of me.