Well the automatics and the sticks do make different power levels. they are rated almost the same but if you put an auto MACH1 and a 5-speed on a d dyno you will see different results. The auto's dyno about 20-30hp less than the 5-speeds and also do not even runs as strong as the 5-speeds. The auto's usually run about 13.7-14.00 flat Five speeds can hang or beat LS1's. That is to funny leaned like a big pimp, I will find out on the crank info and whatever else is different on the auto's and 5-speed MACH's and then post.