It will definitely make the truck have more low end power, and at the same time make the rpms slightly higher on the highway. This will also make the truck respond quicker. Will this be a big improvement ......I think yes. The truck is geared very high for fuel economy. If your ok with spending the money, and you have someone that KNOWS THERE stuff doing the install
Go for it. I think if it were me I would do the 488’s