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These are a deceiving little mod! Controlling the weight of the engine ends up feeling more like suspension work than engine work... obvious when you think about it, but still neat to experience! Bette shifting, better clutch engagement, better throttle response, all come along with this mod too, but damn if this car doesn’t feel more planted on turn in. I will warn anyone with a lightweight flywheel, you MUST have the 608 harmonic crank pulley or you risk excess vibration triggering your knock sensor. As far as ride quality, from 2.5k to 5K rpm it feels stock. Below reveals that you’re lugging the engine and above puts just the right amount of fizz in your drink lol!
Easy install, beautiful product, great anodized finish. Car feels alive with less engine slop, more of a go-kart type of rigidity and feel. Way better than OEM. Slight cabin noise and vibration increase, but that is well received in the overall driving experience. Awaken your 997!