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Is it a gradual or sharp decline of power? Stock heads were not designed to handle the 6400 you probably want to rev to. Also, what intake are you running? I cant remember if you bought/sold an ls6 on here.
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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