Psi vs Cfm Options

[KOU In3]

Ok, I've always been led to believe that CFM was more important a measure than psi and that the larger turbos flow grossly more air at a given psi than their smaller brethren. I understand the basic part that the hot air produced when the turbo is overworked leads to a higher psi reading from the same quantity of actual air.

Here's where I start to get confused though: if we keep the intake charge's temperature constant through effecient intercooling shouldn't these values be the same? Basicly if you pressurize the manifold to 20psi using 120 degree air from a 14b or the same temp and psi from say a mammoth BR580 shouldn't this be using the same cfm of air?

Right when I think it all makes sense I talk myself back into the classic fallacy of 'dude it's 20 psi!'. Is the Someone straighten me out here please.

[AWD DSM 1]

Would it make any sense to say that although they may be pressurizing the same (20 psi say) that the bigger turbo will create more velocity? Basically it gains the cfm by moving the air through the intake at a faster pace? I don't have anything to back this up other than that would be one way to explain why a bigger turbo could produce more air at the same psi.

The temp would also have a big part in it. 100 deg air is much more dense than 200 deg air, thus more cfm.... right? One thing I don't quite understand is how turbo efficency works. Why is it that a larger turbo can produce cooler pressurized air than a small one? I know that no matter how you do it, air will increase in temp as you pressurize it some.

Maybe it's just been too long since my last physics class...