I've produced the graph below by first running the car with the Honeycomb MAF screen and then swapping back to the OEM MAF screen and then repeating the same runs.

As the graph shows, the engine acceleration is more linear at the upper RPMs and the airflow is higher at all stages of acceleration with the Honeycomb screen. The Equivalence ratios are very similar but with the Honeycomb screen the AFR might be at, say, 13.2:1, whereas in OEM it might be at 13:1 at the same RPM. Likewise, the timing is similar, except at the highest RPM with the Honeycomb screen, the timing advances as the redline is approached: this seems to smooth out the "stuttering" that normally appears at around 7300rpm. I have previously suggested that the dip in performance at around 7300rpm might be caused by resonant effects, specific to the Z4M's air-intake, but it would now appear that the problem is more likely to be caused by turbulent effects caused by the OEM MAF screen. I shall now look in more detail at individual parameters at 7000rpm and above to see if the MAF screen is the problem.