One unknown on the exhaust will be how the valving works to change the note. The voltages will have to be figured out and a harness made to work with an upfitter switch is my best guess. From the tasca parts for a gen 2, it's safe to assume that pricing will be similar or higher for gen 3 exhaust parts.
The parts for the 2nd gen on Tasca are $685 just for the muffler while the downpipes are $550 and $408 depending on which one you get. Essentially for the downpipes and muffler you are looking at $1500+. This is assuming that everything from the muffler back on the gen 2 would bolt up to the muffler location with the gen 3 downpipes and muffler.