This makes me kind of wonder what Alpina did in designing the 4.6 motor to generate WAY more increased HP than the 9.5% increase in displacement produced. I'm sure there are those here who could list the differences (please do!), but I wonder how much is just purely programming changes. And how many of those changes could be replicated on a 4.4 engine.

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2014 BMW 328i Xdrive
2011 BMW 335i M-Sport
2008 BMW X5 4.8i Sport
2000 BMW 528i 5sp