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Old 08-12-2008, 03:57 PM   #12
TxZHP04
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Join Date: Feb 2006
Location: DFW
Posts: 5,728
My Ride: ESS TS2+ ZHP
Secondary air operation described starting around p37:

http://www.bmwmotorsports.org/BMW_docs/m54x5.pdf

The context is X5 but the motor is still M54.
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