We heard that the X-Wing added slight gains of low-end torque and even increased horsepower. So we called up Boyesen and had them send two out for us to test, and a carbureted Dyna and a fuel-injected Dyna would be the lab rats for this experiment. Installation took roughly five minutes for each bike and the product retails for $129.95. Check out Volume 40 Issue 10 for the full article with the dyno results.