Single turbo on dual exhaust

So I just have to get this straight

Step 1.
Dual exhaust connected near collectors to "Y Pipe" and fed to Turbine only, not spliced.

Step 2.
Turbine exhaust connected to "Y Pipe" and fed back to dual exhaust meaning that ALL exhaust would pass through Turbine

Step 3.
Figure out the Compressor and inter cooler

Step 4.
Go fast

I cant just tap the exhaust system as in Dusters and my incredible diagrams? the system has to be fed through the Turbine only and it must be equal. Correct?