Sprint Performance Suspension lowering springs are made with the enthusiast in mind. They combine the best of both worlds, a great ride at a height that enthusiasts want. Sprint Springs are designed, tested and engineered in-house by Sprint. All Sprint Springs are shot-peered, heat-treated, pres-set, inspected, tested and performance powder coated to insure a lifetime of durability. They are manufactured in the USA using the finest chrome silicon steel on computerized CNC machines.