Shock Absorber Type 644 WESA Dynamic RearWESA Dynamic with manual compression fine tuning. BMWs Dynamic ESA adapts to conditions in real time. We go further by tailoring damping to your weight, load, and usage and, where equipped with an external reservoir, adding manual high low speed compression adjusters for additional fine tuning. Shock length can be specified to realize raise lower requests, resulting in a fully bespoke setup. See the menu below for the available raise lower options for