They only major changes from the '09 and '10 R/T cars to the '11 up so far is some interior changes for the steering wheel and gauges as well as the driver's side seat being able to slide forward easier for better entry/exit on that side. There is still no avail. aftermarket tuning for modifying the '11 up cars. So if you are into modding, I'd find a lightly used '09 or '10, as the R/T cars didn't get any power bump or change like the SRT models did. Not sure about the Super Track Pack package itself though. Just my $.02!