Higher voltage usually results to a better fuel combustion under certain circumstances. The particular device enhances the voltage from 12V to 16V to an Ultra power plant. According to our friend and co-journalist Seiji (jetter.jp) in Japan who tested recently this device on his Ultra 260X, you do not gain more rpm or top speed but the engine response is much better and there is better feeling and hard pull at middle rpm. On his opinion it is worth having on a 260X if you can not afford a 300X.
