I just switched out my D1s with a ProLumen/Hella-Valeo Igniter bulb (35W). It;s not quite 6000K but better than OEM and matches my MTEC H11 Fogs. The high beam bulb is housed in sort of a tube - you will need a tool that can reach it. For mods, you will need to remove the fender liner and access from the inside of the wheel well. If you remove the wheel, you will have more room to work. BTW, I gave up trying to change the High Beam Halogens - I just left them.