People say there is I just dont buy it, I think the 5.7 has more low end torque cause of the VCT and the 6.1 has better mid to top end power, I have very minimal mods and my car put out for what I feel is decent power and torque, however I am sure past 60-80mph the extra displacement of the 6.1 would let it pull away. I feel if the 5.7 would have came with the srt exhaust manifolds and exhaust plus its air box and tube, the most you would see 15-20rwhp difference and the torque would be the same. Track times are running close to the same. The 6.1 would be a cheaper engine to mod, plenty of ported heads and cams to chose from, its just you personal preference on which car you want. To Mauls Im sure the 6 speed feels faster, but I bet the auto 5.7 would run with you. I have heard alot of people say that, like driving 6 speed r/t and an auto r/t or same with the srt. The sticks tend to feel faster, but for some reason the autos are faster in actuallity. I guess its cause your more connected with the manuals you feel faster. It used to be a stick would kick a autos ass, dang new fangled cars.