Those Citreon things?! hahaha they are almost unbearable to drive
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I like the sound of everybody racing a Spoon CR-Z through London. There's generally a direct relation between the more even the battle, the more fun it is. (Unless you're a person who MUST win everytime, then this formula is no fun for you. Which doesn't matter - cos nobody likes cocks like you anyway
).
Fair battles with a theme could work well too - like hatchbacks only; a classic jap battle (supra/skylines/rx7/evos/wrx's only); or a 'real-life' battle - one where you race in the car you currently own (and have it as it's similarly tuned in real-life too). That could make for something interesting.