RS Series Front and Rear Coilover Kit with 0"-2" Front and 0"-2" Rear Body Drop by D2 Racing®. Quantity: Sold as a Kit. The RS Series suspension kit is our most popular coilover. Featuring a 36-way damping and rebound adjustable monotube design, RS Series coilovers are perfect for the modified street car that also sees occasional track days. This coilover has separate height and preload adjustments allowing for optimal suspension tuning while maintaining full strut travel at all times.