I'm on the ZSpeed/South Bend Stage 2 setup because I was going for the HD CSC. At the time the flywheel was 18.5 lb. Pretty quiet. You'll hear it but it's nothing to the extent that you'd actually care. I personally wouldn't mind it a tad lighter assuming it doesn't have reliability issues.
Improved response, engine braking and reduced rev hang is all smiles from a driving standpoint. Your passengers will hate it.
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