You should order a new key or see if someone locally has them, the dealer or tire shop can take it off. The noise may be from not enough preload. Put the z on jack stands, keep the wheels on. Grab the springs and see if you can shake them.
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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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