Thanks for the answers :) But I still dont really understand. Maybe im just slow.

So then if the CFM doesnt really matter, then technically I can get a 20G turbo and set it to run at 6psi and get massive power gains? That doesnt sound right to me. Assuming that the problem that would cause engine damage would be caused by having too much air in the engine, wouldnt the volume of air entering the cylinders actually matter?

Lets hypothetically assume that some turbo out there makes 400cfm at 5psi. Now lets also assume that another turbo makes 200cfm at 5psi. Assume that the cfm of the turbo doubles every time the psi doubles. Now lets turn up the boost. You run the 400cfm turbo at 10psi, and the 200cfm turbo at 10psi. In reality, youre pushing in 800cfm vs. 400cfm into the engine. Wouldnt the 400cfm turbo be much more likely to cause damage then the 200cfm?