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For more than 20 years Mubea strives to develop and produce highly stressed suspension springs and other lightweight automotive steel products. Despite continuous increase of load stress levels of suspension springs it was possible to significantly reduce the weight of suspension springs while increasing robustness. As a successful supplier the company needs to address the continually increasing requirements of the automotive industry for reduced vehicle weight and CO₂ emission through strong efforts in design and process optimization. Targeted now is a weight reduction of another 10% while further enhancing coil spring robustness. In order to achieve these targets Mubea has again optimized the already established High Performance Process (HPP) and has developed a new and innovative method of designing coil springs. To optimize coil spring design customized Finite Element (FE) software was developed and successfully implemented.