I have the stock sport dampers on the car.
On smooth straight roads I didn't notice much change, I have a section of straight bumpy road on my way to work I drive every day, and the car did seem to handle the many small bumps better without squirming around as much.
I have Stillen sway bars, bracing is stock minus the Nismo dampers. I had looked around at the S-tune braces but I just couldn't bring myself pay ~$800 for the set. Also have urethane bushings in the back.
Could be that you have stiffened the chassis to the point the suspension needs to be tweaked to compensate.
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2011 Nissan 370Z Touring/Sport, 6MT, KAD
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