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except the engine one it's just lighter weight. I've been running a lightweight, underdrive pulley on my SX4 for 3 years now and the stock pulley is dampened like the BRZ, no side effects. others have been using them for over 5 years with no issues either. it helps relieve some vibration coming from the accessories, not the crank itself. at least it's what a couple engine builders told me, I could be wrong, my engine could blow up because of it tomorrow or never. but it works for me and i like the improvement it made.
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