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how limited on boost?

I see one that's run 12 psi on a single keyway.

I'm in the assembly stage of a friends motor, that he plans to feed 12-14 psi. it's an all forged magnum 5.9 Magnum

My build will unclude running upwords of 20 PSI with a centrigugal style blower. Most are recommending 2 keys. Not sure which damper though.

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