I wouldn't wrap the header if I were you. The wraps have been known to crack headers from keeping too much heat in.

I've heard this before, they compared it to Nascar. But I don't see the problem, headers will heat and cool more slowly if wrapped. Is is not the heating and cooling that would crack the metal? 

Turn up the radio 

Already done, now the speakers crackle. I can't win! 

i wrapped my header and my entire exhaust 2 years ago.  it is still in place hasn't fallen off.  i drive it on the mud and the rocks.  keeps my floorboards way cooler then they were before.  i don't find anything wrong with it and i will wrap my next exhaust when i redo it this summer

A few ppl have said the same deal.