Can Top Gear’s 500bhp, 5.7litre V8 ‘Tracktor’ set a new Guinness World Records title for Fastest Tractor? Speed to beat? 80.87mph. Enter The Stig. Watch more of the 'Tracktor'in episode five of Top Gear: Series 25. Find out where to watch the latest series of Top Gear in your country: http://bit.ly/WhereToWatchTopGearS25

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