Air Lift Drag Bag kits are used to pre-load coil spring suspensions for drag racing. They tune the suspension for top performance improve your hole shot and lower E.T.s. Air Lift Drag Bags help solve the torque vs. traction equalization issue for drag racers. Pre-loading the suspension with a set of Drag Bags will even up the loads on the two rear wheels to achieve maximum potential thruse under full torque in low gear.