you should see 1-2psi less in most cases because the intercooler causes a restriction thats where the boost loss comes from. You got to have a leak. I would think you should do ruffly 7psi with that pulley. If you got 9psi before then yeah its low.
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Dustin
2002 GT Mustang 5-Speed
Drag Radials,Sprayed,Powershifted
 
WOOO HOOOO!
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