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ok, this is my assumption, but I'm sure the beam pattern had to be horrible. H4 housings are meant for H4 bulbs, 9004 Housings are meant for 9004 bulbs. If you switch it around you're going to get terrible light output. On another note, H4 filaments are perpendicular to the base while 9004 ones are parallel. You need to convert the bulb and harness when you convert the housting.
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