I had already noticed that you had wrapped the headers, been wondering if I should do the same, but I also remember reading someone with technical knowledge (I think it was Lawrie) speaking against it, in a discussion about Peter B's (Gambalunga) Plus 4 ... so I'm still undecided. Must learn more.
Btw, it takes less than five minutes in idle (starting from cold) to get my headers glowing like F1's exhausts from the old Turbo era ... very impressive ... and worrying.
