Actually, you and Cuda340 are confused. The 5.7L does produce 345hp & 375ft-lbs of tq, but that is in the Ram version. The LX car version (300C, Charger R/T, Magnum R/T) produces 340hp & 390ft-lbs of tq. The Charger Daytona R/T and the Road and Track R/T versions of the Charger produce 350hp & 390ft-lbs of tq. The output on the 5.7L varies from model to model; therefore, it is very easy to get confused with having to remember those versions let alone the different output versions used on the Durango/Aspen and Grand Cherokee.

The 5.7L is the more practical choice as it has fuel sipping MDS which shuts off half of the cylinders, allowing you to avoid having to make the decision between fuel economy and power as it has plenty of both. The 6.1L is for those who's top priority is performance, which you could expect Admiral Faragut to say about it "D@m# the fuel economy, full speed ahead."

There have been some tests that have found the SRT-8s to get 0-60 times around 4.7-4.9secs and that is with an automatic. In short, both are Hemis, just the 6.1L is the more performance orientated choice.