Of course I used autosiliconehoses.com - you can buy all the parts from there but i used a K&N Filter, overall mines about a 57mm diameter kit, it's possible to use larger diameter pipes and that would affect cost and fitment etc. I made a bracket for the kit to rest on using the bolts holding the battery down just from a flat steel bar bent into shape. I'll make a basic guide below. The parts I used were:
All-in-all it's about £100 except I already had the filter which is why I said it was less. Hope this helps and anyone else who's lurking meanwhile I'm off to the car dealer to finish off payment for my new fiesta zetec s black edition