Search man.... we all learn by searching. There is no answer as to "which is the best". You'll have to search and read and decide for yourself. Try googling "4runner HID conversion" for starters. You have a H4/90003 relay by the way. Other than that, pick your bulb color and read up on the different kits. Many members on here have done the conversion, it's a bit tedious. Member [MENTION=63060]rickashay[/MENTION] does projector retrofits if you're not up to the task of install.