Hello. I have an 09 z400 which ive been running stock without an airbox lid. Recently i purchased a ct full system and installed it with the lid on to help from runing to lean. Needless to say it ran ok but when i took the lid off it ran super. So far its not lean popping or has no flat spotts anywhere in the powerband. I even took it for a ride at night to see if theheader was glowing. No glowing. So is it safe to say i can run it safely without a fuel controller? I will eventually get one but will it make a difference in performance and which controller does everyone recommend?