I'm not expert, but very happy with my Powertrix coilovers. Charles is a Z owner andoffers the option to swap out the springs for Swift springs.
Nice review HERE.
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NISMO R Tune Intakes \ Fast Intentions RHFC \ Borla CBE \ EcuTek Tuned\ SPL Camber Arms \ Powertrix Coilovers \ Swift Springs \ Avant Garde \ Wicked CAS \ Morimoto XB Halos \ Custom Fenders \ Hotchkis Sways \ NLP Splitter
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