Thanks for the thought but the OE air filters are still in the intake tubes, they should hopefully stop any rubbish getting in. I dont have any other filters installed. I'll have a look though and speak to the dealers when I get the bike back - see next post!
I guess that removing them also "frees up" volume in the airbox which should have a similar effect to increasing the size of the box by 1l or so. The effects as I understand of a bigger box is to lower the helmholtz resonance and hence boost mid range.
I have heard the counter argument that installing an in tank filter takes up volume, increasing the frequency of resonance, so the opposite should apply when removing the blocks