Indian's 2014 rebirth picked up the brand's story from where it left off, with the Thunderstroke 111 evoking the flat-head engine of yore and complemented by great big swoopy fenders, an image that clicked right into America's V-twin cultural brain. So much has happened since then, up to and including total dominance of American Flat Track racing with the FTR750, and multiple MotoAmerica King of the Baggers championships with the Challenger and its liquid-cooled PowerPlus 112 engine. Technical Editor Kevin Cameron and Editor-in-Chief Mark Hoyer discuss Indian history and their firsthand looks inside Indian engines and development since the brand returned to the motorcycle market in earnest.