H&R 50404-88
This is a set of race springs for e30's (not for ix or cabrio models). If you are looking for track-focused handling that is still comfortable enough to be used on a street car, these are the springs for you. You will get a stiffer and lower ride than stock, and matching shock absorbers must be used. These used to be the SpecE30 spring setup.
Lowering of about 2.2" front and 2.1" rear can be expected, dependent on model and equipment