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But isn't that insulation now TRAPPING the heat inside the engine compartment? "Cover the turbo", sure to contain the heat generated there. But then any heat under the hood is best allowed to bleed off, right (i.e., NO insulation along the engine compartment sidewalls and under the hood)?

Thanks for the feedback, Jeepsinker. And yes, it was DynaLiner I installed at the firewall. And I believe that I am overthinking the whole issue, and that I'll leave it all be as is for now. Easy enough to come back later and add DynaLiner to the inboard side of the hood, or spray your...

Good question, thank you: - cutting down on the cab noise. - already insulated at the firewall, to keep out noise AND heat (in Summer), and maybe that's good enough.

Well, true, that's one solution; a lot of ways to skin a cat... Closing the loop on this thread; it seems like a toss-up FOR and AGAINST installing under-hood insulation: - Arguments AGAINST point to problems from insulation braking up and falling into the engine compartment - Arguments FOR...

I wouldn't say that you're fire paranoid, as much as fire aware. My brother is a fire captain in North Carolina, and talks with him over the years have made me more -let's say- alert about fire. Because when it goes wrong, it can go real wrong, REAL fast. So I hear you.

From recent posting of a new member, regarding his 5-ton, but likely applies across the board for all MV's (with a hood that is, armor naturally excluded): Any good reason NOT to install insulation like Kflex (i.e.trapping engine heat in the summer months, etc)? I recognize it's a judgement...