If you find the Focus a dull and unexciting car, then there is something wrong with you, as it is widely renowned as the best handling car in its class....

Not a lot of point trying to make it faster in a straight line. If you want to be quicker point to point, then suspension and brake upgrades are what you want. A set of ST front brakes should fit on no problem, then stick some eibach lowering springs on it to make it handle better.