Hey mate dunno what that plug is, someone will chime in, prob should be plugged into something though... On my fg it was pretty tight but I managed to get it all undone with the air box out, I just removed the filter, no earls, but it took me a few attempts because I didn't have the right tools at first. But I didn't have much room n my socket to tighten it up back into the engine block, I barely had one click on my socket worth of room, ended up with bruises up my forearms being all wedged in and pushing so hard lol. Looks like the BA f6 has the oil radiator cooler thing on it which is good for cooling but yeah would probably make it harder from underneath. Good luck it's doable so give it a go, otherwise if your not confident no harm getting the tuner to do it.