i have xenon hid kit installed.... even when i had the stock kit.

my left head light bulb keeps on burning out for some reason.. stock ones burned out.. 6000k burned out.. 8000k burned out.. only the left headlight..

the problem is still happening even with the xenon kit

 

I would check your wiring. Which bulbs are burning out? Your headlights or your fogs? If your still under warranty I would take it to the dealer and see if they can test you ballast and wiring. It's most likely coming from a piece of wire that is unshielded or open to moisture, or it could also be that your ballast is bad.