JLU 2.5" X-Factor 4XE Mid-arm System The Rock Krawler Suspension JLU 2.5 inch X-Factor 4XE Mid-Arm System is specifically designed for Sport and Sahara owners who want a complete system, bolt-in installation, and the best articulation of any MID-ARM kit on the market. Our system proves its... MSRP: Was: Now: $2,997.54 - $4,259.67 Choose Options