Back in 2011, Robert Thorne of Littleton, Colo., had set a goal of one day becoming a full-fledged driver in the Pirelli World Challenge series for championship-winning K-PAX Racing. Just under a year later, in the penultimate Touring Car race weekend of that season at Sonoma, Thorne got behind the...

McLaren triumphs range from the Indy 500 to eight Formula 1 Constructor's Championships, but its sports cars have been absent from North American racing for more than 30 years. That changed last month, when two McLaren 12C GT3s tackled the St. Petersburg Grand Prix for the K-PAX Racing team. The...