the engine is at the heart of the experience of riding a motorcycle. The amount of torque and horsepower it delivers over the RPM range is in direct proportion to the feeling it gives you when you roll on the throttle. We know what riders want from a motorcycle engine because we ve been building them for 110 years. Project RUSHMORE gave us the opportunity to dial it in just right. We conducted thousands of road tests with real riders giving us feedback to build the next iteration of the legendary Harley-Davidson engine. Project RUSHMORE - Infotainment More sound. Purer sound.