I'm interested in doing a turbo upgrade on my 2011 6.7 because as we all know the factory turbo is a real set back for someone wanting to go beyond just a tuner. But I have no idea where to start, my final goal is 650-700 hp (w/fuel upgrades). So my question for you guys is who makes the best kit for the 6.7 and vgt vs non vgt? Basically I have no idea where to begin.