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Old 02-13-2006, 07:35 PM
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shaker455 shaker455 is offline
Ultimate Warrior
 
Join Date: Feb 2002
Location: NH
Posts: 4,482
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The int circurt is really not related to the PV circurt as some 4500's have a powervalve as well.

It's my belief that the int circurt was created for race engine that have little to no vacuum and it mask the transition to WOT.