There are a couple of other threads on this. The bulb you will actually have to have is a 3157 as it is hard to find a 4157. BUT, the DRLs will not handle higher wattages. The stock bulbs are 27w and the housing will not handle anything higher. The best bet is to replace the whole DRL housing but as you read the other threads, this has not been a simple thing. I am going to order some Cibie Tangos in the clear fog pattern and replace the bulb with a PIAA Extreme White to match my HID headlights. From what I understand, the Tangos require only a small amount of modification to the plastic piece surrounding the stock DRL location.
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