I recently bought a new 2018 Vulcan S and have to admit, I was not impressed with the low speed fueling. I saw videos on the $159 Booster Plug and heard good things and it’s a placebo. In my opinion, it’s an absolute must have and should have come from the factory with it. It went from an ok bike that I got a good deal on and will ride for a summer to an absolute blast to ride and I can’t wait to ride it again. If you’re on the fence, don’t be. It tames the low speed fueling and engine braking so much...it just feels like a different bike. Oh!! And it’s easy to install. I watched Born2moto’s video on it about a dozen times and knocked it out in about 45 min.