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You can get these: http://www.rallylights.com/detail.aspx?ID=2448
But they come with this awesome warning:
The H13 is quite possibly the stupidest design for a bulb ever foisted on the public. The terminals are so small that they overheat, even at stock wattages, and melt the plastic housing of the connectors. Higher than stock wattage bulbs are offered, but not recommended and we accept no responsibility for their use.
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Btw, I got these whilst waiting for my retro to be completed: http://www.amazon.com/gp/product/B00480KPLW/ref=oh_o02_s00_i00_details
The improvement is slight.