Swap your uppipe for a factory STI uppipe if you want to keep your warranty and still mod it, they dont notice it, trust me.

Also I would get 6k HIDs, they have enough color and still stay close to the 4300k temp of stock HIDs for more luminants. I used to have 10ks in my headlights and fog lights on my old WRX and kind of wish I went to a lower temp.