Hey guys kinda new to the whole forum thing but I'll give it a shot. I have a 2015 Dmax stock w the new DEF system. I'm getting not so decent fuel mileage. I want to run a def/DPF delete on it and right now the only kit I can find is H&S. It's pretty pricey (1900$). But I haven't seen any reviews of it on a new 2015. Anyone out here have one or no someone that has done this? What are the expected mpg hp gains and of course what happens if I have to go to the dealership. Is my warranty completely over? Any help would be appreciated. Thanks