Don’t know if K&N actually make a suitable cone filter. In 28K miles, I’ve never experienced a problem with the Pipercross filter, nor I have heard of anyone else having an issue.
I presume that the cone at the intake end (ie furthest away from the throttle bodies) has been removed, just leaving the one adjacent to the air box? If so, it’s hard to imagine a stone puncturing it!
and I have the air intake occupying the complete left scoop, and as Pesky says, the filter nearer to the airbox.
Have done 14000 miles like this and no problem at all.
I wash and inspect it more often than the book says (just because I’m crazy), every 3000 miles or so, and re-oil it with the special Pipercross oil.
No problems.
According to an old Rob Gibbons / Demon tweeks invoice - the part number I’ve got is K/NRU-3280 �75.78 incl VAT. and it gives an extra 100 BHP over the standard unit - unless you fit toe track rod swivel ends!!! [color:“black”] [/color]