content: I purchased the K&N HA-6003 as a replacement for the stock filter in my 2003 Honda CBR600RR. The fit of the K&N was poor at best. I did manage to get it in, but not without considerable effort. Now that it's in the bike, I am a bit worried about it sealing properly. If I had it to do again, I would go with a different hi-flo aftermarket filter, or the OEM.