Most universal fit shocks are sold with factory valving or semi-tuned valving. For example most Fox Off-Road shocks are sold with some generic valving that has very little compression damping and a lot of rebound damping, the result is a rough and uncontrollable ride. Most King Off-Road shocks are sold with semi-tuned valving. Longer shocks have old school flutter stacks with “solid axle valving” and shorter shocks have “IFS” valving. The result is slightly better performance than if there was no tuning, but not by much. While many companies claim to sell proprietary valving, or to be tuning shocks for Mud or Rocks, 99% of these shocks have standard valving in them. If the salesman doesn’t ask for weights, motion ratios, and terrain, it’s unlikely you’ll receive custom valving.