One thing I have noticed that I think is very significant, is that auto trannys lose alot of power when shifting. Even when you're doing power shifting, it doesn't do any good. For example, if you're at gear 1, and start taking off, and when you want to shift to D2, you gotta let the gas padel go, and wait for a second or two (

), and then shift (althou u may also shift to D2 before leaving the padel, u lose slightly less) then it will change its gear. This causes all the rev'd up power that you had from gear 1, to be basically lost!!!

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Might be little confusing, but thats why auto trannys suck if you're looking for the most power out of your engine!