Just looking at the datalogs for my street runs etc.. My sport 500s make 17psi by 3600 rpm... and I am running only 8:1 compression pistons. Other than that our mods look pretty similar. You listed he gets full spool up of 18psi by 4600 rpm? That doesn't make a lot of sense to me? Here was my 17psi run at SGP, their dyno shows pretty much same spoolup characteristics as I get on the street now.