The supercharger does not have to outflow the turbo; it's not supposed to. I highly doubt that m45 will outflow that turbo. In a twincharge setup, with the turbo blowing into the supercharger, the supercharger makes the D16 seem like a bigger engine. Intake flow requirement and exhaust energy/output all increases with just the supercharger; hence allowing you to run larger turbos with less lag. Stick a turbo on there, and you're cramming air into the supercharger(boost), thus the supercharger's ambient air pressure is up, and your total output(as described above about the boost ratio) goes up.
For example; 10psi out of the turbo going into the inlet of the "10psi" supercharger means the air coming out of the supercharger is about 20psi(there's actually more calculations involved, but assume this for argument's sake).
Many axial turbines and even two-stage centrifugal turbojets already run off of this principle. They even built a special turbocharger("hydracharger") that compresses the air twice(two compressors back to back, one blowing into the other).
Here's an article about the hydracharger(also explains the benefits of running two compressors in series):
Hydracharger & Future Turbos - Sport Compact Car Magazine