We all know about Dario Franchitti: he's an Indy 500 legend, a Scot who has in many ways emulated his hero, Jim Clark. What, though, of his younger brother, Marino? He's running at the front of ALMS races in the US these days with his eyes set firmly on a major Le Mans ride for next year. I spoke to him recently about this - and about his experience in 2012 with the amazing Gurney-build Deltawing.

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