Compared to the 2.5 diameter coilovers the 3.0 Series shocks see a piston surface area increase of 50 in the ride zone, and 100 in the Bump Zone. This translates into increased stability and vehicle control at the extremes of off - road use, with benefits also making themselves apparent in on - road driving conditions. The multi - stage hydraulic Bump Zone featured in these 3.0 Series shocks exponentially increases bottom - out resistance as the shock travels through the last 40 of travel, keeping vehicle dynamics in check during those hard hits or unexpected obstacles.