The halos are part of the actual bezel, and are not removable without serious custom fabrication. All i did was pop open the lights. Take out the projectors, some minor trimming, and put in the new bixenon projectors in place. Then, i took off the old reflector high beam bits, and put the other projectors in there after removing the cutoff plate.
What i did is completely doable with a 50w setup, though im not sure its necessary, my 35w system produces more light than 6 cars combined on high beams.