They go in from the bottom. I ran O2 sims for the rears only to get rid of the ses light. I also agree that a mail order would be a waste when you can have it tuned correctly by one of the sponsors.
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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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