NEW SERIES PREVIEW. Ultimate great American motorsports experience? Chris Harris goes up against YouTube legend and Freedom Factory mastermind Cleetus McFarland in a NASCAR-inspired oval race called the Dirty 30 where former cop cars are fitted out with tanks of performance-boosting nitrous oxide and the risk of a serious rubbing is real.

See how it turns out in the new series of Top Gear. Sunday 8pm on BBC One and BBC iPlayer.

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