Well since you have the tuner it will be a little cheaper. But I think its about $500 for Toms F.I. tune. The thing is he actually gives you a base line like FSworks but then you send him logged data and he then sends you a new tune and you repeat until your both satisfied. And any time you add something and "need" or want a new tune you re data log and get a new tune. Its not cheap though...but well worth it. I got the FSworks tune 5 years ago and wish I had gone with Tom back then.
But I will be getting his tine before I am done with my motor build.
2001 ZX3 2.0L Zetec-
Hatch Nation #42
Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)