Here is a very useful graph taken from the 997 Product Information guide (written by PAG to train dealership sales staff to understand the 997 better).

I believe the following conclusions can be drawn from this graph:

1) The key thing to appreciate about PASM is that PASM Normal is not a single suspension setting but it is instead a range of possible settings. Likewise, PASM Sport is a range of possible suspension settings as well. PASM calculates which setting to adopt at any point in time.

2) The respective ranges of possible settings of each of PASM Normal and PASM Sport do overlap. This is represented by the area on the graph in green and khaki stripes. What this means is that the stiffer range of PASM Normal can be as stiff (or stiffer) than PASM Sport might be and vice versa.

3) -20mm is consistently 'somewhat' stiffer (but not vastly so) than the standard suspension set up in the base 997.

4) -20mm is basically as stiff as the stiffest setting PASM Normal can be.

5) The standard suspension set up on the base 997 is approximately as stiff as the softest setting which PASM Sport can be.

6) -20mm is approximately half the stiffness of the range of settings which PASM Sport can be.

7) -20mm is approximately three quarters of the stiffness of the range of settings between the softest setting of PASM Normal and the stiffest setting of PASM Sport.

8) The standard suspension set up on the base 997 is around three quarters of the stiffness of the range of possible settings that PASM Normal can be.

9) The standard suspension set up on the base 997 is around half as stiff as the range of settings between the softest setting of PASM Normal and the stiffest setting of PASM Sport.

If anyone else can describe any other lessons that can be gleaned from this graph, then please feel free to step in here!