I was wondering if the 4160 is for production or what the weight of the concept is? I have always read Challengers weight... so I believe they are estimating the weight of the production Challenger. At least I hope so. Because if they are talking concept, then it will be much heavier. But I think they mean production Challenger will weigh in the 4100 range. When you look at the weight of the Chargers, then the 4100 is a good estimate.