You can NOT legally retro-fit HIDs, and nor can an Audi stealer retro-fit HIDs.
The headlamp assemblies are completely different.
They have a very high speed leveling motor.
They need integrated high power headlamp washers.
They need a front suspension level sensor.
They need a rear suspension level sensor.
They need an ECU to control the high speed alignment.
The reason all the aftermarket retro-fit kits are so cheap is because they are utter crap, using very poor quality korean crap parts!
If you are in the UK or Europe, do NOT retro-fit HIDs. Instead, try an "upgraded" halogen bulb, like the Philips Vision Plus 50% extra!
Rgds
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Sean - Independent Motor Vehicle Technician (retired) ------ '07 Audi B7 RS4 quattro saloon 4.2 FSI V8 32v (BNS) (with ceramic brakes) - WOW '06/7 VW A5 Golf Mk5 GTI 5dr 2.0T FSI (BWA) DSG, fully loaded, colour coded,  '98/9 Honda CBR600FX, the blueberry trifle 
'03 Audi B6 S4 quattro saloon 4.2 V8 40v (BBK) 6sp manual, fully loaded (gone, but not forgotten)
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