Re: 2006 duratec 2.0 focus
And as far as a header goes, why not just buy a OBX?
I'm about to throw one on my D23, they fit both the 2.0l, and 2.3l, and they come with two flex pipes, 1 for auto, and other for if you have a manual. It cost about $240.
The only other thing I could think of that you would want, is adjustable timing gears?