could be talking about some upgrade that Ive seen that is just a bottle or tube in this case that kind of saves the pulse that the 2-stroke engines we use make and forces the fuel/air mixture back in the cylinder. I will say that it made a slight difference in mine and my nephews pocket bikes. kinda made em feel like they were fuel injected because of the better throttle response and we could lower the idle some so they were a bit smoother. noticeable power gain? NONE. would it work on RC cars? not sure.