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Originally Posted by Drawn05
That figure of 450nm is not really consumer level info. Rather it is commercial data that means that the product can handle applications of up to 450nm of input torque and maintain a low failure rate. I am sure the real figure is much higher than this, as so many 6HP21s have been getting 500nm+ for a few years now and no-one has had theirs die on them (or at least posted on the web about it).
There are a few guys on here that have ATs and are heavily moded and dont seem to have any problems, so you should be fine.
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If you read around, plenty of people getting ATF failures, needing rebuilds at high tq and high power levels - needing uprated torque converters and such... I don't know enough about the at's to say anything much more than 'i've seen people rebuilding them!'
There's a couple of people posting about it on another bmw forum recently