Looking at intake temps in Megalog
 

I'm beginning to think I'm suffering from heat soak on my GM IAT. I've looked around for the answer to this question and think that the "MAT" should correspond. However.. My "Est air intake temperature" gauge on tunerstudio reads around 63C when I idle while my MAT reading from Megalog reads 46C at full boost.

So this discrepancy makes me think that MAT isn't the intake reading. Even if its manifold intake temperature, it shouldn't cool down that much before entering the combustion chamber. Either the MAT reading is wrong, or the IAT is off.

What gives?

Sounds like some coolant based manifold air temp correction factor.

Maybe you shouldn't be using an Estimated Air Intake Temperature gauge?