You don't know which corner the noise is coming from? Did you preload the rear springs? Put the z on jack stands, don't take the wheels off and pull on the springs, if it moves you need to preload them again.
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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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