I had HKS III on my 350Z that were comfortable on the street (not as soft as stock), but were quite good on track. I have IV's on my Mazdaspeed3 and they are stiff for street and decent on track. IV's for the Z will be different.
Quality is good and I had no issues on the Z in 5 years and several hundred hours of track time.
I don't think they will slam the car.
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