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HR 54758-77 Super Sport Spring – Every spring produced by HR comes from the HR ISO 9001 certified engineering and manufacturing facility in Germany. All HR springs are produced from a special 54SiCr6 spring steel which has strength rated at 290000 pound per square inch resulting in unrivaled tensile strength and resiliency. Only from HR HR Super Sport Springs have all the features of Sport Springs plus additional lowering great for the seasoned enthusiast looking for a little more. These high tech progressive springs retain superior ride comfort. The handling of your vehicle will be improved with a lower center of gravity. HR Super Sport Springs give your vehicle the best-looking performance stance. Features: Lowers 1.75 – 2.3 inches on average. Provides superior ride and maximum lowering.