the eCodes are perferrable as they are factory and also haev the city lights, but i have not scored eCodes for my car so i modded them out myself. very easy and it CAN look very clean. you WILL have two little holes where the orange inserts clip into the main housing, its just that how big the holes are depends on how well you do the mod. I have done this to about 6 b5's so far and i get better every time. Make sure you have the correct tools for the job, you will need a dremel with a round de-burring bit, a set of extended neednose and an extended dikes, a can of air duster or an air compressor. make sure you have the extended pliers as it will prevent you from slipping on the insert and having it drop into the housing and scratch it all up. remove the high beam bulbs and it makes it easier to get the rest of the broken pieces of orange plastic out.
here is a link to the AW article:
http://www.audiworld.com/tech/ext40.shtml
hth
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