as mentioned above....DONT use the svt springs on a zetec, it will jack your car up and not lower it....
as for your car.....you can do some exhaust work on it. i use to own a zetec tour and i put a magnaflow quasi-dual exhuast on it when i put the svt rear bumper on it....it sounds REAL good...
plugs, wires, intake, engine dress up, springs, struts, sound system, strut tower bars....
or as it would make everyone completely happy....
you could test the jackson racing supercharger they make for the focus....just a thought.....