strate6 wrote: It just "farts" unsued exhaust gasses back into your airbox...............nothing else.
That's not how the system works. As exhaust gasses pass under the ports in the head, fresh air (from the air-box and through the reed valves in the cam cover) is drawn into the exhaust stream to help burn off excess hydrocarbons. Reed valves are there to ensure exhaust does not back-feed into the airbox.
