Just got off the phone few min ago with rep from SD concepts. Their base twin turbo bolt on kit starts @ $5100 for 5.7+5.9 Gen 1 durangos+dakotas. Adding options such as bigger turbos, intercooler, etc will max the whole kit out at $6500 she said. Not a bad price..my procharger was around $5500. She mentioned they are in the process of moving to a bigger shop so to be patient if calling and no one answers..just keep trying. She said the kits vary in power from 350 up to 700+..thats at the crank. She mentioned their twin turbo kit on a 5.9l Dakota was stock up to 500hp, over that, tuning and other factors come in to play..stronger internals, bigger fuel pumps etc.