Are they worth a purchase? Do you need to adjust anything on the bike if you fit one I guess coz you would be getting more air through that it might run a bit lean?
If anyone has any +/- points that would be great.

Mike

 

I had one on my bike and it did breathe alittle better but I never adjusted my card to really take advantage of it.

 

I ran one on my bike with the stock jetting. Powerband was way too peaky for my taste so I eventually went back to stock. But fairly recently I got the k&n reinstalled and did a jet kit and the bike runs awesome and I can feel better power from around 7k and on.