I have a P1sc installed now on my 15 and am putting 640/570. I am thinking about going to either the D1sc or the F1 head units. what king of gains do you think i could expect? I am running 12 PSI now. I have stainless works 1 7/8 x 3" headers and full exhaust. the intercooler is the standard unit that comes with the base kit from procharger. thanks