"Simplified" is the key word. The six-port is as complicated as it is so that it will have a good idle, low emissions, good low-end torque, good mid-range torque ,snappy throttle response and 247 HP. All I want is the 247 HP. I am simplifying the manifold by eliminating everything that isn't needed to provide 247 HP and good top-end performance.

        You will have to build a manifold for the four port. You will eliminate everything that is not needed for top-end performance, just like I plan to do with the six port. Two more runners really don't add significant effort to the task.

        The difference is that when I am done, the engine will have 20% more power.