There is no detectable difference in the noise when switching modes. Truck sounds exactly the same, just has more horsepower and torque. But if I was Deeregreen, I would not modify my truck! 
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2008 F-450 4WD King Ranch Chrome Edition, NAV, Gold Line-X liner, Camper Package, B&W 5th Wheel Companion, Edge Juice, Banks Intake & Monster exhaust.
2008 Teton Homes Aspen 40' 5th Wheel Camper. War Eagle!
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