Sorry matey, but I really think you bought the wrong car for performance, of enhancing its current performance
The ST or at least a 2.0 would have more punch.
An induction kit is a start, though anything short of a full exhaust will make minimal differences. Basic principals are air + fuel = Power. The more efficeiantly the car can get those 2 together per cycle the better.
Dont know much about the new engines, though the Duratec engine is ment to be one of the best blocks around, it just what people do to them that makes them go so well....