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Cobb Tuning Sport Springs Application: Nissan 350z Years: 2003 - 2007 Part Number: 9A1750 Direct replacement for the factory springs, and designed to work with the factory struts, the COBB Sports Springs reduce the ride height by 3/4" Front and 15/16" Rear. The result is improved road handling and reduced body roll. Precision CNC cold wound high quality Chrome Silicon steel construction. The springs are powdercoated COBB Blue in a unique process for protection against the elements. More Information: Spring rates are approximately +15% for the front and the rear over stock which, results in a sporty feel without being unnecessarily harsh or bouncy. The factory springs are actually too soft for the stock struts, much less uprated aftermarket replacements, to work optimally. Our final spring rates are the result of extensive real-world testing.