I followed on online guide off MGRover. Org which is fine if you don't want to use the stock airbox ever again. As I did it became a bit of a plumbers nightmare as it sits between the starter motor, the cooling fan and below the stock airbox. It should work on all K series as was designed for Freelander and 88 degree versions were used on 1.8t 75 and the TF. I can PM in more detail if you want.
In theory as its on the outlet it 'sees' temperature change more quickly and releases coolant accordingly managing temperature gradients better. As its the dark grey Freelander version it starts to open at 82 degrees as opposed to the usual 88, and it reacts to pressure as well in case you floor it when cold.