H&R race springs will lower your vehicle approximately 2.2 in the front and 1.2 in the rear while increasing performance by lowering the center of gravity which reduces body roll and by balancing vehicle weight for more control over the vehicle. These springs will provide a lower and firmer ride. They are intended to track use. These springs should be used with performance struts and shocks. Actual lowering amount may vary depending on model and engine.
This NEW H&R BMW Coil Spring Set (Race) HR29593 is very good , and works very well . I saved some wealth on it and I think you don't need to purchase a new shocks & struts for a long period.