BMW's been pretty clear about where they're heading, especially in the US. With restrictions getting tougher, BMW has said that in order to keep in line, they may be forced to switch to a more efficient 4 cylinder engine.
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Current: '21 M5C, '15 X6 50i Previous: '18 M550i, '16 550i, '11 335is, '09 E93 M3 DCT, '10 E90 335d, '07 E90 328i
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