Just heard you may get a few bhp and also wouldn't mind a extra bit of grunt. So its pretty much not worth going for and just stick with the standard?
About the Panel filter..... discussed many times on here, but the standard one should do fine... even up to 300BHP. I got a K&N before I read about that.
The K&N makes a slight difference to noise but not much. And be careful if you do get a K&N... they are oiled and to much oil can cause issues with the MAF sensor.
Hope that helps somewhat.