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Chris. I didn't have my motor on an engine dyno, just Dyno Sim software prediction. Both Hot Rod mag and Popular Hotrodding and Horsepower TV did comparos between the Dyno Sim software and actual engine dyno results on the same motor. +- 1-2% was the error factor. My engine builder used this to predict 560 hp at 6k and 564 torque at 4500 rpm. Yah, 20% is about right. 15% for drivetrain losses and 5% for the sidepipes. Total of 20% parasitic loss.