Have you changed yours? Any noticeable difference? Looking at replacing my stock item with a K&N filter. I have fitted them to my jap 4's before. Looks like they are about the same price as a stock 848/1098/1198 filter at £43.78 delivered and last a lifetime. I have never tried any other brand, pipercross etc. I removed my stock filter last night and noticed the air box was quite dusty internally although the filter looks new as it was serviced a few months ago. It was a bit of a faff getting to it!
I have one I ordered before I realised you do not need to change them. Send me a £10 and a couple of quid for postage and its yours. Regards Steve
