From tonight’s Fifth Gear, Tiff Needell conducts a shootout between Audi’s RS 5 Coupé and the Mercedes-Benz C 63 AMG Coupé. The rear-wheel drive 457 hp C 63 AMG and quattro-equipped 450 hp RS 5 both hit 100 km/h (62 mph) in 4.5 seconds, but which crosses the line first?
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