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Originally Posted by 530iDriver
So this is interesting... this version of the B48 can churn out 300HP. If so how can the B58 be justified besides inherent smoothness and the 2 extra cylinders?
What are the key differences in this flavor of the X2's B48 vs the B48 we get elsewhere in the BMW ecosystem?
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The horsepower increase will be from more boost and different tuning, maybe also a different camshaft. It may also have some stronger parts.
Why have B48 and B58? For vehicles that a B58 fits into, a regular B58 will probably be more economical than a boosted B48. Also, don't forget that the exact same changes they make to boost the B48 can also be used on the B58, because these engines are modular.