I drive a 2016 2.7 and absolutely love it. I have modded it with bolt-on parts and like the power gains and fuel mileage increase. I recently installed a SPD catted downpipe and I forgot to retune it and now I have broken cats. The tune I have on my truck right now is for and offroad downpipe. I did order an offroad pipe months ago but it never came so I bought this catted one. I'm trying to decide between replacing them and getting the correct tune OR cutting them and leaving the same tune. I know the pros and cons from both options and I'm fine with it. I do not live in a state that requires emission regulations. What would ya'll recommend?