Way back in the day, I was interested in majoring in the minors. I did a little science experiment. Bear with me.
On my stock turbo/tame tune, I noticed that as I rolled into the throttle (we're talking cobb v2 days), if I watched charge temps, they would DECREASE for a bit before increasing.
Due to being brilliant... wait, no, this isn't my moment of glory. After much thought and 6 of my brain cells fighting with the other 6 over who gets the next chicken mcnugget, I realized that the air was picking up heat from the piping between the cold side of the FMIC, and my temp sensor. Only when the velocity of the air (getting into the throttle) was significant enough to reduce the exposure time enough, whatever that meant, I'd see that quick dip in temp before the whole shebang was overrun by little turbos, a poor quality intercooler, and Arizona temperatures.
So my experiment was to thermally wrap the entire cold side charge pipe with heat tape. It made a difference in charge temps of about.... 2 degrees. It also made the piping stay hot quite a lot longer once it did heat soak. Take what you want from that. It's not a lot of piping and it's not nearly as hot as a metal manifold on the engine.
This is just breaking up some very good heat transfer from the head to a nice quality manifold. Never a bad idea. If you piecemeal a system and every or nearly every chance you get, you do little things like this, in the end you'll end up ahead. It's just solid practice. How much ahead? Who knows. It's not necessary, but none of this stuff is. Some guys love doing all the little detail oriented things. I get that. And FWIW, I felt one of these metal manifolds after a 1/2 mile run and she seemed like she could use a phenolic spacer. Hot hot hot. I have no dog in this fight, but it's hard to argue it's a bad idea.
Chris