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Hi. I have a stock 2004 M3 5-Door. The drivers side low beam bulb went out, so I replaced with a Sylvania H7 bulb. It was dimmer than the originial on the passenger side, and although it was new, it blew out after only several months. I replaced with another bulb from the "two pack" that I had bought earlier. This bulb is also a lot dimmer than the original.

What's up with this? Am I replacing with the wrong thing, installing incorrectly, buying a bad brand, or what?

Thanks for any and all help!!
 

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Hey! I had the same problem back in the days when I went without HID :)

Tell your Mazda garage to check if there are voltage fluctuations for some reason. That is why most of my bulbs blew quick. They fixed the problem with a new fuse.
 
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