What MudWasp said. It works with your current career. Otherwise I wouldn't be able to fly the N10 C1. Congrats on the add-on. You should still get some use from it and down a few EI's / EII's before the EIII's take over. Let's see who'll bag the first EIV.
"Take the cylinder out of my kidneys, The connecting rod out of my brain, my brain, From out of my arse take the camshaft, And assemble the engine again."