what have you done to your car? u obviously have aftermarket extractors, but what else? just curious.
you can find header wrap from summit racing and j.c. whitney. you're choice.
there's a question you have to ask yourself first tho.
-is it melting wires?
if not, its not that hot. if you're melting wires and the plastic from the fan, then yes, you need header wrap.
in my honest opinion, i strongly suggest that you don't. why? i don't think aftermarket header is made to be wrapped with that stuff. moisture gets trapped in there and promotes early rust and degradation of the metal. just look into it and if you need it, do it, but if you don't, don't do it. not worth the trouble.