I know Audi wiring is generally pretty resilient. On Mercs any kind of additional load was likely to cause problems with wiring as merc designed it that way to stop people messing about with it
The older the vehicle the greater the parasitic losses are likely to be
Whether you can replace part rather than all of the unit will depend on whether it has a reflector or projector. The projectors on the a6 are rubbish quality from new so no advantage in replacing them. The reflectors on the bi-xenons can be replaced and is worthwhile. My old Passat benefited massively from new headlight units - the old ones absorbed so much light output the car behind was doing more to light the road ahead, and yet they were still adequate for an mot pass. Was glad I changed them when I did 
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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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22nd January 2014, 03:45 PM
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