Finally, an affordable hid conversion for your 911, Boxster, or Cayman that came with regular halogen headlamps! Now, your Porsche can have that litronic look without the hefty price. This kit is made to work with your existing headlamp housing and only replaces the factory low beam, just like the factory option (the high and fog lights remain h7 halogen). Complete plug-and-play installation, with only one hole being needed to drill into your headlamp case for the new bulb (drill bit included) and installation can be completed in as little as 60 minutes. Kit includes two single beam h7, 6000 k, h7 xenon bulbs, two ultra slim, digital ic hid ballasts, two canbus digital decoders for the newer (987) cars equipped with on-board-computers which otherwise would display a lighting error code, and detailed instructions. (required tool for installation are a rotary tool or sharp x-acto knife and a drill.)