Look at the dyno chart and you can see a gain of 4 horsepower starting at 3700 rpm, and it just gets better from there. The best part isn’t the power gain, but where the gain occurs. Harleys live between 3500 and 5000 rpm and that’s where the power increase comes in the best, right in the thick of it. The Switchback’s 103-inch engine really wakes up from the midrange on. Even better, the upgrades did nothing to hurt torque at lower rpm, where Harleys also spend lots of time.