2012+ Stillen Supercharger People Question

overtureZ

The overflow tank that comes with the 2012+ kits is this metal one shown below, however the instructions I recieved don't match this pressurized recirculating tank.

I know that the bottom port is a return line back to the coolant hardline on the driverside, PLEASE CORRECT ME IF I AM WRONG
And the middle port is where it connects to the radiator overflow port, so does that mean that the top port, obviously a pressure release port, run.. no where?

Where would I run the top port, like shown in the picture

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Auto/Z Enthusiast - Mechanical Engineer - Fabricator - Do it for dale