that's real cheap for a real K&N. i checked their website and they say their universal filters are only for racing, not highway use:
http://www.knfilters.com/universal/universal.htm
never heard of that before. ??? any theories why?
edit:
looks like its just a technicality. this is from their FAQ:
"5. Are K&N filters emissions legal?
All K&N direct replacement filters are emissions legal. They do not require any modifications and go directly in the stock air filter housing. Universal clamp-on filters may not be legal in states where under the hood modifications are not allowed. Since they can be used on just about anything, it would be impossible to have all the different filters tested for all possible applications. Check your local laws if you are unsure."
from here:
http://www.knfilters.com/faq.htm#5