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When most people think of horsepower they think of muscle cars – burly, rear-wheel-drive Detroit iron with chest-thumping V8s and enough power to turn tires into plumes of smoke. But kids today are creating a performance genre that’s all their own. They’ve pioneered what’s called the “sport compact” car. They’re small, typically imported vehicles that come with four-cylinder engines. Their owners modify them to create serious power and head-turning looks.