They're not made by swift, its a separate upgrade. I believe $300? Worth it though to me. I'd say go a bit stiffer. Harshness with the Nismo may be due to more mismatched damping/spring rates than the stock 370Z has. It sounds crazy, but it's not always matched up well. That's why its nice to have custom valving for your spring rates you choose. Helps take away some of the rough ride if the spring/shock combo works well together.
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