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Oh I forgot to mention, I'm sure that if you look at all thoose HID conversion kits out there they are not D.O.T. approved.I did find online aux driving lights that are D.O.T. approved which are very cool looking
The upgrade harness has a heavier gauge wire vers a thin gauge factory wire.Heavier gauge wire means less voltage loss which leads to brighter bulbs.Though the more voltage will cut the life of your bulb but at least the bulb is meant to be used in that light housing.
the upgraded harnesses also use a relay bulit into them, to allow the full 14 volts to reach the lamps, rather than the 12 volts that the stock wires allow. and, they also give you the ability to keep the low beam filament on while the high beam is on.
the 2 features added together really do make quite a difference.