The Porsche 911GT3 RS has been the king of the fast road track weapon category but a German civil war is brewing. Could the new Mercedes AMG GT R and BMW's M4 GTS give the Porsche a run for its money? It's time for Chris Harris to find out. Subscribe to Top Gear for more videos: http://bit.ly/SubscribeToTopGear
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Merc-AMG GT R vs 911 GT3 RS vs BMW M4 GTS -
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