I don't know about them being legal in So Cal... Each state has different laws. I have had yellow bulbs on another car for a few years with zero problems. But then I heard of someone not too far from my town getting pulled over for his, could just be the cop didn't like civics or the kid could have been driving like an ass.
I think they look best when used with clear lens headlights, the stock EG headlights are not clear, they have all the angles in the surface to scatter the light. Do you have stock or aftermarket headlights?
I had MTEC yellow bbulbs and loved them, but one burned out every year. They looked better because they had some kind of irridescent coating over the bulb that made them appear to change color a little bit depending on the viewing angle. I recently bought Lumi-sometheng rather brand off ebay and they are the same yellow all the time, no special coating. They have not burned out yet though
