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I agree with Silver Bullit II & samw1978, about 6,000RPMS. It seems to me from 6K to redline there is not much more acceleration. (Sounds good, though )
you dont have to quite get there, 6400 is fine, just go up there, but be SURE not to hit the rev limiter, getting right up to 6600 isnt that important. the Z has a lot of leeway in its power band.