Well thought I would come on and give some feedback.I came from a tuned 6-4 right around 520 hp and loved the power, but recently purchased the Ndash with sotf for my 15 and after a week of driving I can say I'm very pleased. The shifting is so spot on and mpg is staying right around17.8. That's up about 2 mpg . I'm getting used to the turbo lag because my 6-4 had none but I knew this coming in and I usually am rolling around 25-30 before mashing it and let me tell you when it hits it hits hard and it's like a rocket,I find for daily driving I'm keeping it on 550 and loving driving this truck.can only imagine how it will be with traction bars on and by the way I'm on 4 in lift with 35s.