Hey guys I just picked up a 2018 6.7 Cummins not to long ago and I was looking into getting some more power out of it and a few more mpg with a tuner and deletes, also hate that def crap. I have heard good things about Double R Diesel and Diesel Performance of Texas what are your opinions on these two or any other ones you think I should look at. I was also looking at getting a 12v tune because I grew up around the clattery diesels of old and want mine to sound like that. Thanks.