Cutouts in the bumper are for the pop up washers - early cars have fixed washer jets. You'll soon know when you switch them 
Bi-xenons are not a cheap retrofit unless you happen to find someone breaking one on ebay who doesn't know what they cost from Audi if you break one!! They are nice to have but as long as it has factory xenons of some type I'd just live with it.
Worth putting some more details up of the car you're considering if you want any views on condition/issues/if the car is known
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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