It is my understanding the stock 2012 Si is very adaptive, meaning it easily rejects bolt-on mods and continually makes corrections returning any benefit one might get from a properly designed Air Intake back to stock configurations.
Will this be the case with the reflash? Am I more likely to benefit from a properly designed CAI with the reflash than without? Is the reflashed ECU less likely to reject these minor mods?
(I am aware this reflash was done on a stock motor... although you mention this "should work well with a properly designed intake and exhaust)