I just ordered and received a Range DFM disabler for my 2019 5.3. While the unit seemed to function ok, I wanted to share something it did that I did not like. I am by no means bad mouthing the company or product, but I believe that the fact it disables DFCO (deceleration fuel cut off), should be revealed on their website. This was a deal breaker for me. I drive over the continental divide twice a day. I plugged in the unit and headed up to the divide. Upon heading down the other side, I was constantly on my brakes, even on smaller hills and in 5th gear at 3000 RPM. I promptly unplugged it, and immediately began slowing down, even in 8th gear. I can,t imagine using this in the mountains with a trailer. I decided to send it back,as this was unacceptable to me. I also noticed deceleration mileage was around 40 to 50 mpg, instead of maxed out at 99 mpg. It actually felt like it was giving it a little bit of throttle.
I was curious if the Range Pulsar LT does this as well. I'm guessing it probably does. If anyone knows for sure, please comment.