Well, traditionally Chrysler underrates their times and puts higher numbers for the acceleration times than what they actually do. I think 4.5 0-60 and 13.0 1/4 mile is possible for the 6.1L, espically if they gear the put in a slightly lower speed rear-end. Plus the Charger and 300C SRT-8s are posting times that are just slightly slower than this and they are supposed to weigh more and they don't have a manual to help the times.