My 2015 ccsb full of fuel with a passenger weighed 9580.....
And fwiw, I could run 13.0 with stock fuel and a s366 and trap 98mph on my 2011 ccsb. Dynoed 520...
I would say that the dyno was a little off, but not much. I would give it a shot on another dyno.
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Also on the dyno he was in 5th gear. I just read on my trans today and 4th is the closest to 1:1. 5th it says is like 1.15:1. And also there was no corrections on there.