In the JRZ Suspension Engineering RSone BMW performance part F87 M2 (2015 — ) Complete Kit, the use of the large shaft creates an optimum fluid displacement through the preset compression blow off valve to control the unsprung mass. A special designed piston is used to filter out the large, high velocity movements seen with suspensions on street applications. The suspension allows for adjustment between smooth street use and aggressive track use. With every click (counter clockwise) you increase the damping forces in both compression as rebound making the suspension stiffer. With every click you will notice direct influence on the handling of the car. Therefore, adjusting the suspension is very quick and easy. Find yours at Olsen Motorsports.