We have companies like tsportline for cosmetic upgrades and Saleen claimed to have tuned the model s but didn't touch the battery, motors, or control unit. How long until we have third party companies that offer upgraded batteries and more powerful motors and all the other crap between the two that can be upgrade for better performance. I don't know everything about the power trains and systems but it shouldn't interfere with the tesla os right? I mean electricity is electricity so it won't need to be a tesla battery or motors. The control systems should be able to recognize the aftermarket ones right? Like is the throttle a percentage thing so if you have more power it will work? Will regain braking still work as well as the option for it in the settings? I also read somewhere that auto companies want to make it illegal to change the ecu in your car. As long as your changes don't affect any future safty systems like emergency braking or crash avoidance or other systems running in the background protecting you it should be fine. But what are your thoughts??