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I started this thread and can say that I never solved the problem until I put an LS3 in the car. About 3 years now and no vibrations.
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2003 Boxster S with 2008 400+HP L92 with VVT delete, Comp Cam Thumpr, LS3 intake, 42# injectors, Corvette gas pedal and throttlebody, LS7 lifters, double valve springs, heavy push rods, rocker trunnion upgrade. 2009 corvette MAP. 2009 corvette computer.
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