is there anyone or anywhere i can find out how shortening the runners on a stock intake for a magnum 360, will improve performance?

 

When a intake valve closes the air rushing down the runner causes a pressure wave to bounce off the back of the valve. It then rushes up the runner and then bounces back down to the vavle.If the valve is opening when the pressure wave returns it forces more air in to the cylinder. The length of the runner sets the RPM that it happens .Longer runners lowers it and shorter raises the peak.