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<blockquote data-quote="mcarbine" data-source="post: 8379982" data-attributes="member: 69791"><p>If the face of the lower pulley measures 9" across then it is probably a 4lb pulley since they are just under 9" where the belt rides. The stock upper is a 2.93" so it sounds like your stock up top. Stock boost would be 8lb plus your 4lb lower would put you right about 12psi. If you have a CAI that should add about 1lb of boost but if you have long tubes or removed cats your boost #s would go down a tad.</p></blockquote><p></p>
[QUOTE="mcarbine, post: 8379982, member: 69791"] If the face of the lower pulley measures 9" across then it is probably a 4lb pulley since they are just under 9" where the belt rides. The stock upper is a 2.93" so it sounds like your stock up top. Stock boost would be 8lb plus your 4lb lower would put you right about 12psi. If you have a CAI that should add about 1lb of boost but if you have long tubes or removed cats your boost #s would go down a tad. [/QUOTE]
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