they are pretty low, but everyone knows which e39's are stock and which have been dropped. The e39's lines complement a nice, low stance, so lowering springs is definitely a good idea. But as stated above, dont go nuts, a 20mm and under drop will suffice. Eibach is a fabulous choice, but also pricey in the same respect. Bavauto springs are what i've looked at, but its always a gamble. Post pics if you get it done!
1990 535i 5 Speed +[E.A.T. chip/Powerflow intake/Tri-flo exhaust system/Strut Tower Bar/Smoked Signals/Pioneer Head Unit/Crossfire vr401 amp/12" Crossfire BMF sub/eyebrows/18" alpina replica rims]+
6 cylinders, 5 Speeds, 4 Doors, 3 Pedals, 2 Exhaust Pipes, 1 Ultimate Drving Machine