Those pipes look crazy enough to be a reason to do it. But in all actuality, Other than going maximum RPM at full speed, pipes like that will actually take away direct torque, there is a percentage of back pressure needed to make higher amounts of torque increasing acceleration from a stop or slower speeds. So for trucks/off road vehicles and such should always have some back pressure. In fact there is a race team down here I often get help from, They race only Mopars and that is the only reason why I know them. Even on there drag racers they putt slight cups at the tips to give a little bit of back pressure and have noticed better 1/4 mile time. But your method must intimidate the rest so go for it I have also confirmed this with a custom exhaust shop around here. A similar comparison (But Different) is why Dual Plane Intakes give more torque than single plane intakes and also would be recommended for a heavier vehicle.