I would say you are starting from scratch. It will be the best policy IMHO. My bike hated the K&N until I did the scar and some A/F adjusting. It still wants more fuel. But I will probably go back to stock filter after I dirty this filter up some.
What you own is your own kingdom, What you do is your own glory
What you love is your own power, What you live is your own story
In your head is the answer, Let it guide you along
Let your heart be the anchor, And the beat of your own song.......Neal Peart