Dyno results vary by dyno, brand dyno, temp, humidity, tire pressure etc. Always best to do all runs on same dyno and match the original conditions as much as practical. There is no universal percent to use to get to flywheel horsepower for AWD because the designs vary so much though most are in the range of 20-25%. For reference rear drive percent loss from flywheel to rear tires ranges from 10-15%.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas