If you are reading all the pages in this thread, it will take you a very long time indeed
If by "stock" you mean the motor and ESC, I can comment. If by "stock" you mean the Spektrum radio gear I cannot, as I have always flown my models with those cheap little Tactic systems.....which have never failed me. (I guess, if you find something you like, you stick with it...
It won't take but 5 minutes of research on this thread to determine that the T-28 has all the power you need stock, and frankly, it'll take the average flyer a long time to "outgrow" it. In fact, I don't think I'll ever
outgrow this model as it is such a blast to fly. PZ scored big-time with this one, and it's legendary status amongst RC modellers stands testimony to that fact.