What is so "bi" about it ? As far I can see, my 05 X5 driving lights are xenon, but high beams are halogen. Can someone explain to me what the difference is between the pre-facelift xenons and the current bi-xenons ?

Thanks

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'82 Autobianchi A112 Abarth (weekend toy)
'89 Lancia Delta Integrale 16V (very fast weekend toy )
'02 Z3 ///M roadster
'02 ///M3 SMGII