The Audi RS3 is the most powerful new hot hatch money can buy. With its 400hp 2.5-litre, five cylinder turbocharged engine sending power to all four wheels, it has the potential to shame some serious machinery in a straight line - but how does it compare to its closest rival? The Mercedes-AMG A45 lines up alongside to settle the score with a drag race. And just to see whether or not you need to spend £40,000-plus on a new hot hatch, we've thrown in three cheaper - but equally exciting rivals: the
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