Whats potted? Why are they not water proof? $220 doesnt seem far off from XD. Dont get me wrong XD is where I am leaning but If I can use a OEM Denso one I would rather; Especially if they warm up faster.Yea, I have seen OEM ballasts. TRS sells them. But they are made for D2S bulbs whereas we need AMP connectors for our bulbs. TRS sells the Denso OEM with AMP connectors, but a lot of people don't use them because they are $200+ and you have to pay to have them potted or water proof.
Not sure about the corollas lights.
I use DDM ballasts in the RAV with Morimoto bulbs. I've been thinking hard about getting some Philips 4300k 9006 for the RAV. But man those DDM ballasts take forever to warm up compared to my XD ballasts.