Tonio - this is one of the few occassions where you will see me write 'dont buy off Ebay'....
I've seen K+N filters cheaper from places like pdq:
http://www.pdq1.co.uk/ and TTS
http://www.tts-performance.com/ (who do pipercross as well) - and usually their post and packing is cheaper as well.
I've always stick with K&N as I bought a kit containing the filter cleaner and re-oiler that still has not ran out after three years!
K&N oil filters are niceas well - built in nut on the end !!!
Frank