Just like the title implies I want to get a procharger for my 4.0 but most kits offer the P-1SC and the 2 core intercooler. The D-1SC and 3 core are upgradeable options. I figure if I am already dropping around $3500 on a supercharger I might as well go big or go home and buy the uprgrades that are offered. I havent seen anybody that has these upgrades on their 4.0. Can anyone speculate as to how much more power I could gain from the D-1SC and the 3 core. Procharger is pretty vague with their numbers (they just say 50-70% gain) and like I said I havent seen anyone with this particular setup. Can someone please help a fellow sixer lover out?