Porsche 914 Rear Coilover Kit with Koni Shocks. We start with a Ground Control designed rear lower shock mount. Machined from high carbon steel, and using a grade 8 bolt, this rear lower mount is designed to carry the weight of the car after springs are added to the shock. We utilize a Koni monotube rear shock, adjustable for rebound damping. This shock is available in our standard default damping for standard width cars, or heavier damping for wider cars with higher spring rates. The Koni shock is mounted inverted for less unsprung weight, and features the exclusive GC coilover hardware with single-locking sleeve and your choice of Eibach race spring. The same kit is used to supplement rear torsion bars (PCA Stock Class) or by choosing a different spring rate, the rear torsion bars can be removed completely. If you are considering over 700 pound rear springs, we recommend fabricating a double shear rear lower mount to supplement our lower mount.