Why bigger turbos make more power than stock turbos at same PSI

I might be iinterested in a turbo upgrade eventually depending on the cost vs performance upgrade benefits, but I don't have the time to be the guinea pig.
 
I'll get some taken and up soon, its negative something or other out today so wont be doing it today, lol. I haven't really taken many of it other than specific shots of part installs and what not people have requested. 
 
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