what kind of cutting? I have a facelift 330 coupe with halogen projectors. Does that require cutting also?no you do not need any kind of relays but you DO need warning cancelors. All you need is the HID kit and warning cancellors. If you have halogen headlights then you need a conversion kit because the way your plugs are set up on your stock halogen headlight, they wont fit with the HID kit so you gotta do some cutting and such..