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A bonestock 8AT RWD M235 makes around 320 torque to the wheels on a Dynojet. That equates to 380 ft/tq at the flywheel.
To swap in a different 8AT or DCT would require a monumental amount of reverse engineering to get all the various computers to talk to one another. You'd be FAR better off just getting a 6MT M235/M240/M2 (the 6MT can handle a ton of power), or new/used M2, or used M3/M4 for the amount of money we're talking about here. BMW electronics are crazy complicated. It's not like a Subaru or Honda where many things swap over and are plug and play. BMWs are much much much more advanced, for better or worse.
I seriously wouldn't worry about the 8AT if you're running a tune and downpipe only and don't race/track the car all the time. If you plan on running a ton of power and/or race/track often, then you should consider a 6MT M235/M240 or DCT/6MT M2. Simple as that.
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The forest was shrinking, but the Trees kept voting for the Axe, for the Axe was clever and convinced the Trees that because his handle was made of wood, he was one of them.
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