Pro Comp Nitro Kits are the economical alternative to a complete suspension system. The Nitro Kits utilize coil spring spacers, torsion keys, and strut spacers to achieve front lift. This leaves the factory steering geometry intact, preserving factory ride quality and handling. The rear lift is achieved through coil spring spacers or lift blocks. If you want to add larger aftermarket wheels and tires to your rig without installing a complete suspension lift kit, Pro Comps Nitro Kits were designed with you specifically in mind.