Thats my point... if the Challenger concept's body is made from carbon fiber and it weighs in at 4160, then there is no way that the production Challenger will be lighter. And the performance that you see it posted with, will be off also. But I really don't see them weighing as much as a Charger and some weigh in at under 4300 lbs. So something does'nt seem quite right. I did read the tag and it says what is posted 4160. But it just does not seem like it should weigh that much.