This weekend I will be installing the DET turbo pieces in my NX. I will be transfering over the intake manifold and water neck from the DET to the DE. For this reason I will have the coolant line for the Turbo. The question I have is: which coolant heater line should I tap the coolant back into? There are two lines against the firewall. Which one should I use for the coolant line return from the turbo?

Thanks in advance,