Well there would be one question left... why did I spend $500 more on a 12mm if a 10mm would make the same power on my 40 overs
Not every truck will react the same so if you go 12mm cp3 then you don't have to worry about being on the edge of it supporting it. It all has to do with the parts combo and the amount of air it is moving. The more air and happier the setup is the more power it will produce. I wouldn't take the risk of it not getting the job done with a 10mm.