What we have here is a tuner for 2015-2018 Ram 1500 5.7 Hemi. It’s an in line tuner. Piggybacks off ECM. This bad boy really wakes up the Hemi. Can turn off MDS correct tire size and gear ratio. Used for a month and a half and traded truck. See images for more info on the unit. Retail over 500.00 asking 350 or offer. 300 for paid members.