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Buying long tube headers with emissions is a huge mistake (Im guilty of this too). The emissions parts never make it back on after the install. The tubes with block off plates clutter the engine and make it a pain to change plugs and wires. Also, when blocked off, the tubes are a void for capturing heat which can lead to cracks in the headers.
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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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