Hey there, sorry about the late reply - I never noticed I had a user message! Anyway - To simple answer your question, you do not need a harness or an error eliminator. All you need is the HID kit. Nothing else. No, I went with the 35W - I'm pretty sure the majority if people here on Prius Chat have 35W. It's plenty bright enough - trust me on that. Don't get 55W. It'll be a bit too much in my opinion. Taking the head light assembly out to get the bulb installed on the passenger side would be a good idea. The driver side bulb is very easy to get to. However, the passenger side is pretty difficult. If I knew how to remove the assembly I certainly would have. good luck!
I had Toyota do it because as it turned out Safelite was only 20 dollars cheaper. It came out to $600 roughly
My bad, I don't get on PChat much. Anyhow, the both front windows are 80%, and the rear windows along with the rear winshield are 50%. Again, sorry for the delay.
