Hi , since a while I got a problem with my 2002 Boxsters lights. When I do put it on wile I am driving it could take up to 5 minutes before it goes on. I never observe that before. If I turn the lights on before I  start the engine, then no probleme at all. 
I tryed to install the xenon lights a month ago but was unable to have it working.So I put the original lights back on. The only things is the holes that I had to drill to let the wire going trow. I don't know if this could affect. 
This is a USA model. 
So Sorry about my english. 
Let me know if you have clue.
Thank you .