i'm using 100/90w H4 bulbs on my 123 sedan. From my experience, i would say upgrade your wiring. From the stock wires to thicker gauge wires, plus a pair of relays (or you could go overboard and use two pairs; 1 pair for low beam another for high beam - but why?.. eheheh) then definitely upgrade your bulb sockets to ceramic ones.. bosch makes these.. dont use the stock plastic bulb sockets.. as these will melt.
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