Cars that don't have many supported flashing devices.

I have a 2015 Dodge Dart 1.4T that I would love to be able to tune myself as i have a tuned flashed to it that i feel could be improved upon however the only company that seems to have support for it is Dimsport and they want $7500 for their tuning package. I also would like to stay with the stock ecu as I know in these newer mopar vehicles that when you disconnect the ecu pretty much everything else stops working in the car. Has anyone had any experience with using Dimsports products or is there another work around i could look into?

I am right in your same boat. I have a '14 2.4 NA Dart that I'd like to tune myself to learn more about the process. Do you have any resources yet as to where you can go?