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  1. ridge68

    Only getting 10 psi with VMP 2.5 pulley and 90mm idler...any ideas why?

    I recently installed the VMP 2.5 stock look pulley and 90mm idler package on my 2012 GT500, along with one step colder Motorcraft plugs that VMP lists on their site. I already had installed a Steeda 113mm cold air kit, Corsa Extreme mufflers that I kept from my 11 GT/CS, along with a Steeda...

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