So glad I replaced the OEM filter when I did. My pinhole in one corner had turned into two corners having 1/4" breaks. This happened in about 800 miles. I've stepped on the accelerator quite hard a few times and I'm guessing that the turbo just pulls so much air through that the filter breaks under the stress.
This thing needs to breath. I just put in the afe Pro Dry S this afternoon. It turns out that it isn't exactly square and you have to turn it until it drops right into the box.
Getting that air box back together is a real bear! After I loosened the metal strap that attaches the intake box to the engine air intake hose, it moved a bit better. I had to grab and pull the left side of the lower portion of the air box towards me with my left hand and push the top back hard with my right hand to get the tabs in the back to snap into place properly.
Even without specs on the afe filter performance (haven't seen any on the OEM either, for that matter), I did some eyeballing to satisfy myself. I held both filters up to the sun and both let about the same amount of light through. Not scientific, but it satisfied me that the afe wasn't going to let anything significant into the engine.
Whatever the case, it's way better than an OEM filter that would lets ants, moths, and small twigs take up residence inside the engine.
Seriously, though, with the rate the OEM filter was degrading, it could have opened up completely at some point in the near future and been no better than having no filter at all.