Port my current M1 single plane or install the RPM Air Gap?

The dyno run in post #38 is a perfect example of 'it ain't necessarily so'.....
While some might bet their favourite ******** that a single plane always makes more HP, that test proves otherwise......
It also highlights another aspect of this hobby, that there are many variables such as port/runner size etc that work better on one engine, but give less output on another engine.