i hav xenons on my a3 and am very impressed with them.only prob is finding a main beam bulb to match them.im using philips vision plus at the moment and am reasoably impressed. i have to questions firstly has anyane used piaa extreme white bulbs? and secondly iv noyiced that they are now doin xenon plus on the a3.is this xenon main and dipped and if yes can the headlamp unit be retrofitted?if so can my old unit be used to upgrade someones standard lights? thanks for any help