I would recommend coating and Marc Haibeck told me (I think he's OK
with me quoting him):
I discovered high temp wire sheath. It's like the covering that GM uses except it has a higher temp rating and is silver to reflect heat. For the one or two wires, PN 2652K31. For the O2 sensor cables, PN 2652K32. For the clutch hose, PN 2652K33.
Available from
www.mcmaster.com
Marc
I have it on my car.
Looks cool.