RS-R Down Sus lowering springs for the 2018 and later Subaru Forester (SK9) provide a lowered stance with specified spring rates: front 3.33K and rear 4.90K. These springs are offered to alter ride height and spring rate for the listed Forester application, giving a firmer, lower setup compared with stock springs. Fitment is explicit to 2018+ Forester SK9 chassis applications where those rates are appropriate.
RS-R 2018+ Subaru Forester (SK9) Down Sus Springs (FR Spring Rate 3.33K / RR Spring Rate 4.90K)