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Old 01-31-2008, 08:41 PM   #8
flatthump
Scooby Specialist
 
Member#: 102749
Join Date: Dec 2005
Chapter/Region: SCIC
Location: Fullerton, Ca
Vehicle:
2005 impreza STi
OBP'

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The back pressure will help keep the air fuel charge in the cylinder on the very begining of the intake stroke, instead of it flying out the exhaust valve.....during valve over lap.
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