Safety Upgrade HID (Xenon) Headlights & Light Emitting Diode (LED) headlamp bulbs:

As you are probably aware the headlamp units pop right out of the 993 using the release levers on each side in the trunk.

High-Intensity Discharge (HID) Low-Beam Headlamps:

You may not be aware that when doing a low beam HID conversion on the Carrera, most any aftermarket HID lamp kit that includes the “slim” ballast will fit completely inside the headlight unit and are fully reversible. The generic kits are inexpensive but feature longer high-voltage wires than needed for a 993 and so make for a less neat install than the kit offered by https://www.bergvillfx.com. 

Here are some useful notes if you plan to do this very satisfying DIY project: 

Appendix “I” “ Installing High-Intensity Discharge (HID) headlights on 993: the gotchas”. 

Light Emitting Diode (LED) headlamp bulbs:

Recently, aftermarket LED headlamp bulbs have become available. For our cars, using a xenon low-beam in combination with an LED high-beam bulb has become popular. Keep in mind the LED high beams can be considerably brighter than the original Halogen bulbs, and one's goal is not to blind the drivers of cars in the opposing traffic. 

4/15/2025 - After some discussion, the performance of LED headlamp bulbs varies quite a bit. Although they can seem quite bright when compared to the original halogen bulbs, some of the bulb designs don't work well with the stock reflector /lens system in the 993. For this reason, I would only consider a Brand & Model of bulbs that have gotten good reviews on Rennlist or other 993-focused forums.

Headlights need to be both bright and throw an appropriate pattern so they provide good brightness and a pattern that does not blind opposing traffic.

Aiming aftermarket modified headlights