There are folks selling Xenon replacement bulbs at ebay.
Claim to just replace halogen. No need to change power system or wiring.
Are those real xenon that can compare to
factory "Xenon" option?

 

I've read about some of these Xenon and other gas fill mixtures. I don't think there is a lot of advantage in them unless you are willing to experiment with different bulbs in the standard system. Some of them are sold in the 55 watt range and some are sold in the 90-100 watt range in which they claim are brighter (duh, of course at 2x the wattage!). I would not go to the higher wattage with standard wiring and relays, just too much stress on the electrical parts for the long haul.

Do a search on this web site ofr SilverStars and you will find many good comments about them.

The best bet IMO is the SilverStars. You can find them at most autopart stoore and on the web. There is a significant difference in whiteness and brightness - a best buy!

PS, 100 watt lamps are illeagle in many states.