Recently, I have been looking at the viability of retro fitting a HID headlamp system to my '07 A3 2.0 Tdi Sport. It's not the standard lamps are bad, but the HID system is so much better. There are numerous kits available from various uk sellers but I have a few questions if anyone has any experience or knowledge in this area. Some sellers list their kits as not suitable for the A3? Does the lamp run hotter? if so, does the headlamp lense need to be replaced? Obviously 1 kit comes with 2 bulbs, so this is just the low beam as the A3 runs a h7 low beam and separate bulb for main, SO fitting 2 kits to include the main beam would be beneficial but would it be necessary? as how often do we use main beam anyway. Has anybody fitted a kit? and which supplier / kit is the best?