I drove a automatic first in the R/T . It felt alot like my wife's 06 300C I got her new. Sounded like it also. Then I drove the 6 speed R/T . Sounded and felt much different and I purchased it . I enjoy it . But after two trip's to the track . Both 1/4 and 1/8th mile. I'm not very good at the track with the 6 speed. Maybe better the next time with the new tire's I'm putting on soon. I think the auto has the edge for most at the track . But my 6 speed did much better this past winter on snow and ice than my wife's 300C with automatic. And I get better gas mileage also.