This twin-cam, air-cooled beast puts down 109 pound-feet of torque at 3,500 rpm, a gain of almost 8 pound-feet over the 103ci engine, which is a little shy of what this displacement does in the actual CVO models. But that’s just what the specs sheet says. In person, the big engine proves to have a nearly bottomless well of torque that is impressive in the (relatively) light Softail chassis. Grunt everywhere, terrific throttle response, and it’s even pretty smooth thanks to twin counterbalancers, which have been part of the TC-B engine series since 2000. Other updates for the Slim S include a hydraulic clutch and Stage 1 high-flow air cleaner.