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I love how people are claiming that because the lightweight pulley's work fine on other Subaru's, then it has to be fine... Come on! This is a brand new engine design, yes it is similar to other Subaru engines, but what isn't similar may be enough to enhance the problem of adding the lightweight pulley. I am not claiming that this is the cause of the OP's problem, but it is a high probability or possibility. Can people at least admit that this may have been a contributor due to the unknown's of this engine?
As for me, this is one of the last upgrades I would ever install on any car unless it is designed correctly and still includes a harmonic balancer/vibration damper like higher cost lightweight pulleys do.
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