My understanding is that the revised part has more robust bushings, but, not having seen one, I couldn't say for sure.
No one seems to notice any difference between a functioning part and one that has been disabled, at least from just running it on a butt-dyno. In theory, the engine should have a flatter torque curve, more torque in lower rev ranges and slightly better fuel economy. That hasn't been clearly demonstrated, however.
The only true way to know is to run a before and after dyno session.
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