Avoid wheels any bigger than a 15" for handling, any bigger and it will make the handling suffer. Anybody who tells you different is talking bollocks.

2. Fit good quality tyres.

3. Fit good quality struts and springs (coilovers are not the bee all and end all of suspension).

4. Avoid a drop of more than 35mm

Stick to those 4 points and you'll have a sporting chance
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as above but i didnt want to go more than -25mm as i relly hamer it around the lanes as for power there is plenty of gear to buy