Oh, you mean like the additional power loss associated with spinning the heavier AOD internals, and turning the front pump? How about the fact the AOD's gearing is quite a bit inferior due to the T-5 having 4 gears and an OD and the AOD having 3 gears and an OD.
Also the extra weight (50lbs+) associated with an AOD car vs a T-5 car. Not to mention the shift points on the stock AOD are much harder to control than a manual, and it usually shifts quite a bit early.
If he wants to run with a 5spd, he needs one step lower gearing than the 5spd, a quality shift kit, and a quality 2800rpm stall converter or so. Additional cost $700-1100.
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