The studs that hold the manifolds on arent that bad. The only trouble with rust are the studs holding the y pipe and manifold together. But they usually snap before the nut comes off.
Hopefully you bought race headers and plan to delete the AIR/EGR. It will make your install much smoother.
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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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