You may want to check that the spring mount is flush with the frame of the z. I know some people had issues with this. You can only tell if you take the springmount off and see if the Metal tabs are not bent.
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2010 k23
H&R sport springs / Spc rear camber arms / SSR SP1 / Berk cbe / Varis cf lip / Nismo S-Tune side skirts
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