I have H&R coilovers. Very Very Happy with them. I have them on my M3 and GTI as well. H&R coilovers use bilstein shocks/struts and you know you can't go wrong with bilstein.
There is no rear adjustment with the H&R's. I actually don't think that it would lower your car any since you have a S8 and they are a little lower then the A8. I have a 2000 Short wheel base A8. I ended up cutting 1 coil off in the rear to get the car at the perfect ride height. The fronts have plenty of adjustment. Because of the way way the spring is designed with the top 3 coil loops completely compressing on one another when the car is under load there is no change in the spring rate by removing 1 of the filler coils.
The car has settled and is a touch lower then it is in this picture.
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