I'll have to refer you to J-Lab, Mani, or Mangler here on the group. They'll know the approximate costs of the various options. IIRC it's about $400 bucks for the SVT exhaust new from Ford. Try some searches in the Performance section to get a feel for the relative costs and performance preferences.
Since I know you're very conscious about makin the paint shine, I thought I would remind you that there's a guy in Stittsville that sells Zaino from his home. It's not much more expensive than anything from Canadian Tire. I have his info too if you're interested.
Harry
hwebster@canada.com