From photos I have seen, it seems firewall insulation was common/standard on the model IV. I've seen some series V5-7 with firewall insulation, but most appear not to have any. I was chatting with a tech counselor at an EAA meeting tonight, and he put it in my head that I was going to die a terrible death with my feet on fire if I don't insulate my firewall and ditch the grommets for fireproof firewall feedthroughs for $60/pop.

I found a couple old threads on this, but I was curious if you guys are insulating, what you're using and how you're using it, and for those that aren't, why not?