This is probably one of the most important upgrades when it comes to doing a facelift or updating the vehicle. It brings it to the current generation. This is also Euro style. Make sure you choose the right chassis, or it may not work. For example E92 one will NOT fit E93. These are plug and play. These will only fit pre LCI and will not be an LCI replacement. LED resistors are included. Harness is also provided if needed. Coding should not be required; times warm bulb check may happen and flicker during start up.