I really like the BC Racing ER Series coilover that I have. These are in the mid range coilover category, with the KWv3. They offer enough rebound adjustment to change from super stiff track to soft like OEM. Rebound is super easy to adjust and they have remote reservoirs which are also plusses. I have not tried anything else on the Z so I can't compare but I have had lots of coilovers in the past on other cars.
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