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I can tell you the 335i uses the ZF type g transmission, which is the same as in the 650 and M5/M6, It is a very strong 'box. Ask ZF how much torque it can take. The block is probably fairly strong given its modern design, but the high comp. ratio will cause big problems with high boost. Diferent pistons will help, or perhaps the old cylinder head spacer or thick copper gasket will do.
The direct injection is a bit complicated, with up to 3 injections per firing event, but the high maximum fuel system pressure should leave scope for lots of increase in fuel volume.
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