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      05-28-2012, 01:13 PM   #12
greentrbo95gst
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Drives: 2013 Azurite Black M5
Join Date: Jan 2011
Location: Orange County

iTrader: (4)

I have always followed hard break in on all my cars and motors ended up being stronger and producing a tad more horsepower than the ones that did easy break in.

http://www.mototuneusa.com/break_in_secrets.htm