Hey Johnie, A lot of Harley guys run these but they will work on most V twin engines. I've always heard them go by the name Hyperchargers. Its just a aftermarket setup that is suppose to, like I said suppose to per advertisement give your V twin some more HP by the design allowing more air to be sucked into your carb. They do look good, but weather it really does what it says it will do your guess is as good as mine.