^ +1 and weight reduction: delete the rear seats and seat belts, get rid of sound deadening, egr and air delete, ac delete....depends on what you can deal with.
I did all the free mods and cant say I felt a difference. The filter gets dirty a lot faster with the free ram air. Interior noise is louder w/o deadening. more room where seats were though.
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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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