Just read on the Harley USA site that the new 103 motor comes with improved performance via a new cam, anyone know what they have done?
High Output Twin Cam 103™ Engine
Asking riders if they’d like more passing power is like asking them “Would you like more beer in the pitcher” when they have reached their final destination at the end of a long, dusty ride. Everybody wants it, and the new High Output Twin Cam 103™ engine is 103 cubic inches of Harley-Davidson V-Twin you can rely on to deliver it. There’s a new airbox for increased intake airflow and a new cam that optimizes phase and duration. The result: better low end torque and faster 60 to 80 mph 5th gear roll-on to get you around that 18-wheeler. In the tradition of the Flathead, Knucklehead, Panhead, Shovelhead, Evolution® Twin Cam 88® and Twin Cam 96®engines that came before it, the new High Output Twin Cam 103™engine is raising the bar for the feeling an engine delivers to the rider. There’s a reason we’re called the Harley-Davidson Motor Company. Once you send some fuel this one, you’ll have do doubt what it is.