Xenon or HID (High-Intensity Discharge) bulbs have no filament unlike halogen bulbs. The brightness of a xenon bulb is 3 times better, for a 2 times lower consumption.
The Xenon Kit will replace your original bulbs without modification on the support. The connections are made directly on the original wiring, and you may need to drill a hole in the headlight cover for the cables on some models (gasket supplied).