You will need a tune, Hemi Fever did mine and I would recommend him.
Another thing to make sure is you have your fuel sync set. If you have not done this yet. You will need a drb or snap on scanner to set it. I have mine set around +4. The factory manual says i believe anywhere from -10 to 10 or something like that. People say set it as close to zero as you can, others say +4...mine seems to like +4