How about the differences in Correction Factors then? Here's a table showing the differences in power at different (simulated I presume) heats on a Dynapack

Air Temp (°C) Peak Power (DIN) Peak Power (SAE)
10 167.0 kW 169.9 kW
35 176.3 kW 186.4 kW
50 185.1 kW 236.9 kW

Source: http://stmtune.wordpress.com/2012/06...9-kw-for-free/