1) HVAC - my only concern here is removing the heater core. Spohn went ahead and did it, but I've seen conflicting opinions on this in general for a racecar. It's kinda nice to have as a defroster option on some track days, esp. early AM or in weird weather. I'm so excited about ripping so many things out of my car too, though, that I'm likely to do it as well and hope that rain-x / fog-x and paper towels and rolled down windows suffice!
7) Wrapping the headers in-place sounds like a real bitch, even with the radiator, etc out of the way. Also, donno about PPE's coating/metal, but FI recommended against me wrapping mine. Said the wrap would trap condensation against the pipes, eventually drawing out nickel and/or causing corrosion, etc, and you'd just end up having to replace headers faster (this was comparing ceramic coat, uncoated/wrapped, coated/wrapped, and he recommended coated+unwrapped).
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