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      01-24-2008, 09:23 AM   #16
sdiver68
Expert Road Racer
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Drives: 07 335i e90, 09 335i e93
Join Date: Jul 2006
Location: St. Louis, MO

iTrader: (3)

476 = actual measured hub HP.

Times a drivetrain factor, let's use 10% because we do not have roller losses associated with a typical dyno.

= 523 HP

Minus 22 HP claimed for the exhaust

= 501 HP stock...underrated by ~21 HP using the above assumed drivetrain loss of 10%.

= 525 HP stock using 15% drivetrain loss, so ~45 HP underrated.