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Old 10-07-2012, 09:28 AM
gotrice415 gotrice415 is offline
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Location: San Francisco Bay Area
 
Join Date: Apr 2012
Posts: 66
Mein Auto: M3, 335Ci, X5d, 750i
If you have an N54 back pressure is critical for waste gate/turbo operation since the flap is actuated in exhaust.
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