Yes there are plenty of parts, but you're starting out with a 2L 4cyl vs. 2.5L 6cyl. There is a good many parts available for the duratecs as well. A 3L swap being the cheapest for the gain.
I'm all for seeing fast contours, whether it's a zetec or duratec. But for most of us, it's a lot more cost effective to upgrade to a v6. My SVT when I'm done with it (including new headlights, fixing the tranny, and a header) will put down better numbers than hector's zetec and cost less than what he sold his for (now think about how much he spent to get the power he did). I know from experience (just look at all the stuff on my zetec).
Now for serious power, you're probably gonna spend the same on a zetec or duratec. But most of the people on this site aren't looking for huge amounts of power, so it just makes senses for MOST people to go with a v6.
