have an 03 f4i and i was just wondering what the headlight bulb size is becuz i want to order my hids... high and low beam please

 

H7, but if you're trying to get both lights to run on low beam, you'll have to do some rewiring, adding a relay and running power wires off the battery (fused of coarse).

 

thanx bro

 

Or just get some Bi-xenon HIDs then both can be hi and low

 

But they still draw too much current through the stock wiring, it usually melts the solder inside the switch, and may melt the harness, or worse. Flame on. Thats why the power has to be supplied by new wiring, from the battery. And the factory "hot" wires for high/low beams fire the relay accordingly.