kingkong Posted August 22, 2012 Report Share Posted August 22, 2012 I purchased my 2010 GT500 used. (4,000 miles). I has the following upgrades as far as performance: from american racing: H-pipe headers mac mufflers also Shelby heat exchager and VPM pulley for the supercharger. here is my issue: I don't really hear the supercharger whine and the PSI guage doest move even when i punch it. any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
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