I'm building an Indy with Zetec engine. I intend to use the original inlet manifold, and to feed air in, and keep everything under the bonnet, I'm considering one of these sets. Are there any do's/don'ts? Will it fit?

Marcel,

I thought the main issue with retaining the Zetec's original inlet system was the manifold, not the filter system. To keep things cheap, i'd go for a universal filter (prob' a pipercross, or even a universal autostyle thingie, since they are cheaper then K&N over here) and get some PVC plumbing from your local home improvement (Gamma, then!) shop. Any big improvement on the Zetec you have would mean a set of throttle bodies, and binning the filter anyway.

BTW, how's the build coming along?