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If you want the most light output, go with 4300K. ALL factory HIDs are 4300K. 6000K is used on the Le Mans cars, but at a higher wattage than the 35W capsules we get for the street. The difference between 4300K and 6000K is the mixture of the gases inside the capsule that insulate the arc. 6000K capsules produce a bit less light than 4300K will. Anything over 6000K is created by coating the capsule blue and thus significantly reduces the light output. I have replaced a pair of capsules in a BMW with 6000k when one burned out, and did enjoy the result.
Now, for the debate over putting aftermarket HIDs into conventional, halogen housings- not a good idea. You can get away with it in a projector type assembly, as you have a focused lens controlling where the light goes, but in a reflector type housing (which the halogen Porsche assemblies are) its a horrible idea. All those aftermarket companies do is take a standard D2S or D2R HID capsule, and mold it into a halogen bulb base so you can stick it into your assembly. The problem is that the source of the light output is different from a bulb to an HID capsule (generally much more forward in the case of the HID capsule, which is not what the reflector was designed for), and you wind up with horrible amounts of spill and an often very incorrect beam pattern. This is not only less than ideal to drive with but, much more importantly, is downright dangerous to oncoming cars as the result can be extremely blinding, and is illegal for the reasons I just outlined.
If you want HIDs, get factory Litronics.
Patrick
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