Pipercross filters

[Dudeofrude]

I just bought the pipercross because it was washable.  I wouldn’t think a change of filter in a standard air box would result in much of a change in air flow, if any at all.

Youd be surprised. From the test results and things I've read up on the aftermarket/race filters can have up to 30% more filtered surface area so they do let more air through and obviously more air + more fuel = more power but to be honest the gains are negligible. 2-3bhp claimed and that's the max.
I have a modified airbox and power commander etc so its worth the extra few quid for me to get the best out of what I've got.
If my bike was standard then I would definitely be using hi flo filters for the price