To increase handling.......Better tyres, wider wheels, however wider wheels aren't so great in the wet.To increase power, while you still don't have a clue, I'd suggest changing the exhaust system, including the cat. A de-cat wouold be best, but if you want to pass the MOT emissions I doubt a De-Cat would still let you pass.honestly, I'd leave it alone and get a bigger engined car. I suppose you could take out the rear seats and spare wheels and any extra weight, and drive round on half a tank of fuel, that would help a little and cost nothing.If you don't know what you're doing, take it to a garage or a tuning company, they'll sort you right out..........Think of the insurance though!As an after thought.........you could get it chipped or remapped, that would be pretty simple, but you would need the software or take it to someone who does, lots of gains that way