Hi guys,am going to replace the air filter in my 2.5 xten,was thinking about K&N,then saw Pipercross are doing one also,what's the better of the two,or is there another better one available ?

Piper cross, green, k&n all pretty much the same, 'dry' ones are considered better as they don't interfere with the maf.

I bought as cosworth one but they need replacing every 10k

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Ramair filter is very good. Don't get too tied down into expensive filters as none that beneficial & after few years they perform no better than a qaulity new oem one & the original gain of new performance to a new oem is very small numbers.. Multilayer dry foam types perform well in balance of airflow & filtering, everything else tends be airflow at expense of filtering ability.