Well for one i have a stock style internal waste gate on a evo316g .
Boost control isnt too great to begin with.
On an external w.g. setup that has far better boost control then yea this will be impossible.

Putting denser air into the compressor means it squeezing more air in to the intake track. The turbo will still dramatically heat up this air...
Now you have more air in the intake track, heat it up and it expands again which becomes more Pressure. Pressure being what we consider boost.
Now that might not be technically correct but not too far off.

To simplify it for you,
Im sure several of you guys with dsms still on internal waste gate ( unported) have "boost creeped" on particularly cold nights, especially in the higher gears...
So think about it..
What is different than a cold air intake causing the same effect?
Pre compressor has nothing to do with intercooling or waste gate or none of that when simple temp changes affect boost output. ( Were still talking internal wastegate here.)
Colder air entering the compressor is still just that.

Now, like i said, i installed the cold air intake. It was already a cool night to begin with. I changed nothing under the hood but the cold air intake.
On a 3rd gear pull, boost rose to 23 psi from 21..
It had never creeped/spiked etc to that psi before unless iturned up the boost.
I had to go under the hood and turn it back down.

If my explainantion doesnt make sense to you then you explain what happened, and dont say nothing like " I hit my mbc by mistake when i was installing the CAI and made it increase."