Well, I am also a newbie like you, I also claimed the Porsche 918 Spyder, but claimed it too early. Just couldn't wait another day so, got it on the 6th day itself. I upgraded my 918 to 803 before the event finished and after the event, it became 813. I upgraded only the first upgrade kit and now it's pretty difficult to upgrade the epic parts after claiming the car. Since it was my second event car, I had no knowledge that there will be two level upgrade for upgrade kit 1 in this event, so I sold 4 upgrade upgrade kits for scrap. Now I am finding hard to level up and stuck at 814.