you run street tires at 20 psi??? that might be your prob right there. i don't run any lower than 26 psi usually around 28 or so.........in my old LS1 Z28.
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STROKIN' IT SINCE 09/03/06
2008 G8 GT Ignition Orange - New Era OTR intake, PM-FL Axle Back, SuperChips Cortex Tune
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