Do you notice any difference in power, pickup etc?
I would suggest that you remove the original air intake piece, which is directly behind the front grill (next to the radiator) - this will let more air get to the air filters.
The RH side is easy, LH is more difficult - in fact I left the LH one in.
There's two plastic rivets, and one screw I think that holds them in.

It's not really ram air either, but we'll ignore that!