Rebuilding a 2008/2010 engine

From a quick google search it appears that the first under-drive pulleys were not true harmonic balancers and thus introduced vibrations that damaged motors. A true balanced underdrive pulley shouldn't cause any problem.

Though, I really would like to see some documentation on the HP increase from an underdrive pulley. All the ads say "Up to" which in reality means, we tweaked the livin snot out of the motor and made this amount of HP, some of which may be due to our pulley.


Regards,

Joe Dokes