Wasnt aware they were offering such; are there Performance figures quoted ?
You dont mention a 2nd Turbo, so wondering if it gets anywhere near 535d territory?
Added: found details dated March, 2013 - bhp up about 30, to 286; Torques to 600 - think I'll wait till I can afford a 535d !
http://www.matlawrence.com/images/bmw/powerkit.pdf
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M140i LCI-2 is the 16th BMW since 1977 ....
320i *2, 323i, 520i *2, 540i, 535i, 840i, E36 M5, 328i, 530i, 320d, 535d, M135i, M140i * 2