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I'd question the wisdom of running that type of power long term or even short term on an X1, though I do think packing that much power into an SAV that's not expected to be that quick off the line is quite amusing.
For the transmission, the X1 xDrive35i uses a ZF6hp19 according to bmw parts catelogs (though there are some reports on the 3 series forums that the 35i matched 6hp19 trans is a 6HP19TU (aka zf 6hp21 possibly)). If the X1 has the standard HP19 transmission it's only designed for up to 295lb and if it has the stronger HP21 trans it's still only designed up to 335lb.
If you're really pushing close to 500lb or even over 400lb I don't know how long that transmission is going to hold up.
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