nberry:

 

If the 997.2 manual has 20 more hp, the results should be the same but the difference smaller assuming equally talented drivers.

well its not only 20hp... tuners tested both in same dyno, and the 997.2  did  40WHP MORE THAN THE 997.1...
 

 

997.1=400whp

997.2 440whp

actually this thing is putting something like 520-525HP Smiley