The best bet for reflector fogs is replacing the H11 bulbs with H9s, minor plastic trimming of plug required.

The H9 bulbs are used for sportbike high-beams, 50% brighter with a 10 watt increase in draw.

I installed PIAA Extreme White 4150k bulbs, good match to the OE Xenons in color and brightness.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!