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Jeremy Clarkson heads out on to the test track and pits the new Audi R8 V10 Spyder against the latest version of Porsche's enduring 911 Turbo cabriolet. Go to http://www.youtube.com/TopGear to see a full list of all high quality videos available on the Top Gear YouTube channel and don't forget to visit http://www.topgear.com for all the latest news and car reviews.

BBC, Top, Gear, Transport, Motoring, Cars, Audi, R8, Porsche, 997