you can get the 65mm throttle body from here for £120, dont let some UK performance parts place rip you off charging you £250!

http://focus.c-f-m.com/index.asp?Pag...PROD&ProdID=20

i have got one on a supercharged zetec and its very very good.

i reckon it would work OK on a NA zetec so long as you have good induction system, bigger bore maf, good exhaust and manifold, proper mapping, and maybe port the intake of the inlet manifold out a bit to make use of the bigger diameter TB.