If you look at the photos on the dealer posting (namely, the interior shot), it looks like there might be Nitrous on this car (two wires and buttons next to the shifter). Thats probably how they got the power up to 350. I wouldn't want to drive this with the six speed. There must be a pretty damned good reason why DC never put the manual transmission in the SRT-6, probably because it wasn't designed to take that kind of power or torque without ripping apart.