[HID Headlight Ballast Replacement] The headlight control unit, a crucial part of the HID lighting system, provides the voltage needed to start the lamp and regulates the electrical current of the light once it is turned on. A faulty ballast will burn out your bulb. Each ballast is designed to connect directly to your vehicle and does not require programming or coding. [Replace Part Number & Easy Installation] 63126948180, W3T13271, 6 948 180, 626.11.104.99, 63 12 6 948 180 [Fit the following models] for 3 Series 2006-2008 (E90 / E91) Sedan & Wagon only (Not for Coupe or Convertible) - S80 2007-2015 - V70 2008-2015 - V70 2008-2015 XC70 2008-2015 [Premium Quality] Made of premium aluminum for better heat dissipation and vibration resistance, 6 overpressure protections, Low pressure, overheating, no-load, short circuit, reverse connection for more safety and durability [Safe Start & Stability] Built-in bag can accelerate the current conduction speed and save power consumption for a