Tiff Needell and motoring journalist Chris Harris put two track focused supercars through their paces – the Ferrari 458 Speciale and the Porsche 911 GT3. Tests involving agility, road manners and head to head racing will decide which is best. Jonny Smith visits the Ascari Circuit in Spain to take place in an unusual challenge. He must attempt to beat a lap time set by a very fast Audi RS7, which is completely automated.