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Just check the flexplate for cracks around the bolt holes. Its not a bad idea to replace it if you want to avoid failure in the future, but its not necessary.
Aftermarket flexplates are heavier and increase rotational mass. The increases rot mass will eat up some HP, but it will hit harder off the line due to increases inertia.
TCI makes the cheapest (under $100) bang for buck steel plates, and FTI makes a very nice ($300) aluminum one thats close to stock weight.
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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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