POLARIS RZR PRO XP 4 2.5" X2 SERIES REAR PIGGY BACK EXIT SHOCKSZBROZ 2. 5 X2 Series Rear Piggy Back EXIT Shocks were designed to give you the ultimate driving experience no matter the terrain. Whether its racing through the mountain trails, high speed desert rally action or those challenging rock crawling lines, the X2 Series Exit Shocks offer easy compression and rebound adjustability at the turn of dial. Get the ride quality, control, and performance you demand to take your riding to the next level. The 2. 5 X2