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Old 04-23-2008, 12:11 PM   #4
jaxscuby
Sammo Hung
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Member#: 10613
Join Date: Sep 2001
Chapter/Region: South East
Location: N Fla / S Ga
Vehicle:
2002 USDM WRX
WRB

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stock boost ~15 psi (14.7) for stock plugs
20 psi get the colder plug.
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