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5857 billet is rated 605HP
3076R is rated 500HP
The spoolup characteristics will be similar, but more top end from the 5857 due to billet wheel. The billet wheels don't require as much material to maintain strength, so they can machine more material out of the wheel leaving the area around the center bore thinner, and the blades thinner. This allows for faster spool, and also more air flow through the blades and therefor more power.
How's the clutch holding up brother?