If you have a canned SCT tune, then you have the user option of a cmrc delete tune. This not only turns off the check engine light & disables the cmrc motor, but it also loads new spark & fuel tables. SCT developed this bin file and it's not really a bad tune at all.
However if you already have a tuner with a "custom" or mail-order tune loaded in it, then you will have to get a retune. Some shops will retune for free if you bought your tune from them.
But yes you need a tune from somebody for the cmrc deletes.