Ive got a 04 Focus 1.8 Zetec, what i want to know is, what can i do to increase the power of my car, but what the cheapest way to do this is? i know this is a vague question but im not that 'up' on all the technical details, but im learning lol

Any help is good help, but dont go straight into technical data, cos that might just go over my head lol

Thankz