concept is right the gt is 5.1 and the chally is estimated 4.9( might be lower). so i dont know where you got 4.9 from for the gt. yes axel i agree they are similar in performance but the srt8is faster and is a more performance oriented version of the r/t with the 6.1 in it just as the gt500 is the upgrade from the gt ( well in fords case roush stage 1 2 3 6748588 saleen bullitect ect lol jk) so to say oh the srt 8 is comparable to the gt is great but u can also say the gt is comparable to the gt500 because its only .5 slower in 0-60 and the r/t challenger with the srt8 theres only a .5 difference. you compare by the levels of performance. you should be starting this argument against the r/ts when they come out and the numbers come out.