2017 Harley-Davidson® Softail Slim® S Nothing gets more respect on the street than power. So when we built the Softail Slim® S, we loaded it up with the most powerful engine you can get in a cruiser. American Muscle The bobber style of the Softail Slim® model gets dialed up with the Screamin’ Eagle® Air-Cooled Twin Cam 110B™ engine, black triple clamp and riser, gloss black headlamp ring, black fork slider covers, black lower forks, black and mirrors, black over/under shotgun exhaust with slash cut mufflers, and optional military themed graphics. The Softail Slim® S. Modern power. Old iron attitude.