Calculating Turbo Size for Twin Turbo Setup

In short
i need to flow 40lb/min of air to meet my horsepower goals and I’ve calculated a pressure ratio of 1.74 desired. (5.7psig manifold pressure)

now I have two t25’s available to me. Is it possible to use these without exceeding the Choke line.

Looking at the turbo map 1.74 will give me 20lbs (im assuming that a second turbo would just double the value) but this doesn’t seem safe.

In short do i have to increase boost to move my self in a safer range, and to what point.

now this is the turbo map im following

I’ve just learned all this stuff today, so i may be missing some important concepts here. If you want all the values that i used for my calculations just let me know… to lazy to type them out.

Steve