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

The RPM AG & the RPM are the same intake manifold minus the extra metal and port to allow the intake to be warmed up when it gets cold outside.

As per dyno results, they perform exactly the same. So, if it’s competition, short run use, they’ll perform the same. If it’s auto cross or any long time driving, more than a few minutes, the AG version is what you want.