Header wrap?????
then you would perhaps keep too much heat in and
put it onto the primary welds, thermal or heat cycle
issues as the welds are the weak / brittle point.
Further down the wrap is a probable bonus to O2
sensor operation.
Just have to balance the amount of heat to be kept.
I would say to wrap from 2" below the last (if any)
AIR / EGR fitting, to past the O2 bungs. Though
maybe you will get a more authoritative answer.






