We have a crazy deal on a couple of sets of Koni Sport lowering springs. These are European made "street/Auto-X" springs that work well with good condition stock shocks or upgraded Koni or Bilstein units. Koni lists their own lowering specs on their website but the numbers below are an average of what we have seen when installing them on customer cars.
E36 6cyl - approx 50mm front & 30mm rear drop $175 set!
E46 6cyl - approx 40mm front & 30mm rear drop $175 set!
Buy a set and be happy *wave*
www.tunerworks.com