Why doesnt K and N offer a jet kit for the blaster filter? Whenever I see an add for them they always say N/A but only for the blaster. Are they not required?

 

K&N does not make a jet kit for a blaster but you can buy the filter and outer wears for aroun $35 If you do buy one make sure you put a little grease on the bottom of the filter to seal it up. You also should clean and oil it after every ride.
As for jets if you run with no air box lid you may have to go up one size on the main jet. Do a plug chop to make sure.