Yes, you can run 100w bulbs, but there's something to do before you run them... do a good rewire job for your headlights with heavier gauge wiring. Maybe install a good relay as well. The 20 year-old wiring for our stock headlights isn't good enough for reliable, thorough illumination with even our stock headlights, much less a high-watt set of H4 bulbs. Do the rewire first, test the results and then decide if you need to go with the 100's.
Oh, depending on how cheap and poor quality your housings are, you might want to invest in a good set of housings, probably Hella or Cebie. Cheap housings usually do a lousy job of proper light dispersal and control.
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