basically what as been said. the dust, never mind all the bigger stuff will get drawn into the engine and cause problems.
as davalva has said. remove the filter and smooth out the airbox with a dremmel, chisel, and sandpaper. for noise drill a couple of 1" size holes on the pre filtered side and wash out.
i wouldnt bother with a performance filter to be honest mate a OEM one with be about a tenth of the price and its unlikey to have any difference in performance on a smaller engine. OK its reusable but by the time youve bought 10 OEM ones your probably thinking of changing the car even if done every 6 months