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As cool as the self leveling is, I only think it matters for cars like my 740i, and only then if I have two fat friends in the back seat and all our golf clubs in the trunk. On a car like the Boxster, there just isn't that much fore to aft pitch changes to worry about. If you retrofit Litronics to your car, you should get a small control unit with the kit that will angle the HID low beam up to help the high beams when you engage them. It is basically the same control box as the factory Litronic equipped cars get minus the self leveling.
Now, why you do want Litronics over a cheap retrofit install, is beam pattern and lighting efficiency. The halogen assemblies are nothing special, and just use a simple reflector based design, of which the reflector was optimized for a halogen bulb. The HID converted "bulbs" put the light source in a different location than the filament was, and so will produce far more "splash" where you don't want it (which is very often into the eyes of oncoming drivers) while not putting as much light on the road. Also, the heat of the HID can damage the halogen housing. Furthermore, if you care, it's technically not legal do to a retrofit install like this.
The Litronics, on the other hand, use an ellipsoid lens to focus the beam pattern, and were designed from the ground up to house a D2S HID light source. They are very efficient at putting light where it is needed, and minimize glare to other drivers. Not to mention, the cosmetic improvement to the car is striking.
They're not cheap, but in my opinion, absolutely worth it.
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Boxster S
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