Like Dolt said, go with an EJK Gen 3. I just installed mine two weekends ago, with a SE hi flo a/c and less restrictive slip ons. Simple install. Trickiest part was just removing the gas tank. Started right up afterwards. I fine tuned 2 modes just a wee bit, and it runs great now, and much cooler. Tuning is very simple. Can't beat the cost. If I add cams later, a few tweeks of the buttons and we're riding again.