Step 1: Remove the battery if needed.
Step 2: You will then see the back cover for the HID bulb, remove it.
Step 3: After you open the back cover, unlock and remove the D2 or D4 plugs by twist it counterclockwise.
Step 4: Release the metal clips that holds the D2S/D2R or D4S/D4R HID bulb
Step 5: After release the clips, you can remove the stock 4300K HID bulb and directly put back the JDM D2C or D4C HID bulb back in. Make sure the JDM D2C or D4C HID bulb is inserted exactly the same position as the stock 4300K HID bulb is removed.
Step 6: Put back the plug and re-lock it clockwise.
Step 7: Put back the back cover and remount the battery if applies.
Finally: Enjoy the new light.