I currently have a 2013 Model S (85) and I'm starting to mull over trading my "vintage" car in for a new one with all those cool autopilot features. And I want red this time... So, other than the nose cone, headlights, HEPA filter (yawn), what else has changed between 2013 and 2016? I read a lot about hoe Tesla is continually tweaking the assembly line to make the car better. Just curious if any of these "improvements" would be tangible and noticeable to a 2013 owner. Thanks for your toughts!