If you don't think it'll make you lean, why are you fitting it?
A performance air filter that doesn't pass more air isn't up to much...
You might be able to get away with it, I did for a while, but it definately made the bike sluggish and probably less powerful. In the long run, it could cause you damage. If you don't want to rejet, best stick to stock. And if you want power, best not muck about with the K&N since hte BMC Race RS is far more effective. (and
definately needs rejetted)[/i]