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If you have a gt35 journel bearing and a ball bearing turbo, and compair their respective spool times on multiple engines, you will see the ball bearing spool considerably fast especially on smaller engine. On your LS car I would estimate 300-400 rpms.
Is it worth the upgrade, I would say yes because your getting better throttle response and shifting your power curve to the left, creating more use-able horsepower and torque.
Regards
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