Worth pointing out that the flow calculator you are using is not applicable to control valves.We know from the PCM's turbo flow model the stock turbo flows about 24kg/min tops.
Now it's time to pull up our favorite simple online flow calculator and we see that With the 43mm plastic funnel in the stock hot-side boost pipe, the velocity in the funnel is mach 0.643 and the pressure drop is 323mbar, or 4.68psig -> our max boost expectancy with the stock piping is 1.34bar or 19.4psi @ 6500. Still makes sense, uh?
With 2.5" boost pipes the stock throttle at 57mm is the next bottleneck. At 82° max angle the effective area is 2197mm² which correspond to an unobstructed tube of ø52.9mm. Back to the gas flow calculator,
You appear to be trying to work out the pressure drop across the butterfly control valve when it is in the fully open position.
You need to do a Cv (flow coefficient) calculation. Specifically a gas Cv calculation.
You have the mass air flow rate at 24kg/min.
You can usually get the Cv of the valve at the fully open position from the manufacturer. Knowing the max Cv and the mass flow rate you can calculate the pressure drop. You can do this for each of the TB sizes and then compare the pressure drop.
The calculator you have linked is based on Bernoulli’s equation and assumes a constant density, neglects the length of piping, surface finish and bends.