The ZBROZ Stage 1 Dual Rate Spring Kit for Walker Evans Needle Shocks are the best single modification you can do to your RZR. This spring kit will improve your ride in every condition and vastly improve your ability to deal with the added weight of accessories. Your stock springs are not calibrated for additional aftermarket accessories but we have taken that into consideration with this kit. You will have more stability and better small and large bump dampening ability with this simple upgrade that you can install yourself, or choose a local ZBROZ dealer and have them set it up for you.