No I didn't know you had too or could, I just changed the paper filter for the revo one as per instructions
when I did the write up for the airbox mod, I recommended removing this as it's a resonator and quietens down the induction and turbo noise.
I've carried out the rest of the airbox mod, which includes opening up the intake on the slam panel too.
I still run the oem paper filter...which I will change to, most likely, the vwr filter.