I have been talking with Joey off and on for the last week and it seems this is a good quality CoilOver system. There is a special price right now for both the premium and pro systems. If you have any questions let me know and ill pass them on to Joey since he doesnt have an account yet. I do NOT work for Yellow Speed Racing.
Yellow Speed Racing Dynamic Pro Sport (DPS) Coilover System
98-03 BMW M5 E39
Description
The DPS coilover system is a 33 way damper and rebound adjustable monotube full coilover system. The setup has separate height and pre-load adjustments allowing for optimal adjustment and allowing full strut travel at all times. Pillowball upper mounts and top mounts are constructed of 6061 powder coated aluminum. Threads are teflon coated to prevent rust. Rebuildable and serviceable in the US.
Features
33 levels of adjustable damping
Made from high quality 6061 aluminum with T6 for increased hardness
Adjustable spring perch for height adjustment
Adjustable body allowing maximum suspension travel
Pillowball top mount with adjustable camber (not available for some models)
Monotube high pressure design reduces oil leakage
Electroplated body for protection from corrosion and rust
Contents
Set of four coilovers: front left, front right, rear left, and rear right
Spanning adjustment wrenches
Dampening adjustment keys
Spring Rates: 10/560 kg/lbs front, 8/448 kg/lbs rear
Yellow Speed Racing Dynamic Pro Sport (DPS) Coilover System
98-03 BMW M5 E39

Description
The DPS coilover system is a 33 way damper and rebound adjustable monotube full coilover system. The setup has separate height and pre-load adjustments allowing for optimal adjustment and allowing full strut travel at all times. Pillowball upper mounts and top mounts are constructed of 6061 powder coated aluminum. Threads are teflon coated to prevent rust. Rebuildable and serviceable in the US.
Features
33 levels of adjustable damping
Made from high quality 6061 aluminum with T6 for increased hardness
Adjustable spring perch for height adjustment
Adjustable body allowing maximum suspension travel
Pillowball top mount with adjustable camber (not available for some models)
Monotube high pressure design reduces oil leakage
Electroplated body for protection from corrosion and rust
Contents
Set of four coilovers: front left, front right, rear left, and rear right
Spanning adjustment wrenches
Dampening adjustment keys
Spring Rates: 10/560 kg/lbs front, 8/448 kg/lbs rear