High performance springs have high stiffness to mass ratios (they're light) and they have accurate spring rates. Everything manufactured has production tolerances. The problem is, standard manufacturing tolerance for spring rate is +/-5%. We are dedicated to manufacturing the finest springs available. Race Tech High Performance Springs have accurate rates better than 2% because we 100% test our springs. Straight rate, chrome silicon, high stiffness to mass ratio (light weight for their rate), shot peened, heat treated and pre-set (no sacking). These are the finest springs available, period!
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