Can't speak about the Stillen flywheel quality, but the ACT pressure palte and disk is awesome. I used the ACT HD/SS (which this kit includes) on my Evo IX and loved it for Auto-X. It only firmed up the pedal feel slightly over stock, but not much to even notice. The engagement was really smooth and not much shudder. This pressure plater should hold up to around 420lbs TQ.
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