Ive had a K&N on mine for a few months now. It hasnt given me extra rocket powerd performance, BUT the engine revs much more freely through the whole rev range.
It sounds great when you want to boot it and remains quiet when normal. (sounds monster on a VR!)
Its a cheap mod to start with and will compliment anything else you may want to add.
I had a big list of stuff I was gonna do, but a house purchase put an end to that (a wise man puts money away from the eye of the Missus)
Good luck
