All header mfg say that they do not warranty if wrapped.
Newer ones are Ceramic coated inside and out so it does not emit heat much.
> Only if you what to see the headers ROT!
>
> J.R. Wright
> GMC Great Laker MHC
> GMCGL Tech Editor
> GMC Eastern States Charter Member
> GMCMI
> 78 GMC Buskirk 29.5’ Stretch
> 75 GMC Avion (Under Reconstruction)
> Michigan
>
>
> > On Jun 9, 2021, at 3:34 PM, Robert J. Gogan
> >
> > I have tried multiple wrap products on my headers and none of them last
> more than a few months.
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--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk
http://www.gmcrvparts.com
1-800-752-7502