Is this a ProChamber with catted legs or not? Some people get away with not using MIL eliminators on the catted setup. If you are going for the off-road (non-catted) setup, you'll need them and the extension harnesses without going down the path of getting a tune.
Your signature image is not appreciated. Please remove it.
the MIL Elim kit did not work for me, i still pulled the code for rear o2's detecting faulty catalytics or whatever it said. this was on a catless xpipe setup. i just re-installed my then collecting-dust diablo and disabled the rear o2's in the tune, i also added some timing and leaned things out a bit and got a bit of power gain on the butt dyno.