This replacement rear spring is designed to work on all 525i, 528i, 530i, 535i, 545i, and 550i models. B3 replacement coils are designed to restore your cars handling to the way it was from the factory.
As the springs age, they begin to compress or "sag" allowing the body to sit lower and slightly altering the motion of the suspension. Because of this we strongly recommend replacing these in pairs in order to ensure safe and predictable handling characteristics.
ECS Tuning also offers Bilstein B4 struts and shocks that pair flawlessly with B3 springs and truly restore your vehicles lost handling capabilities.
These are are a "heavy duty" replacement for vehicles with standard or non-M sport suspension.
This Part Fits the Following Vehicles