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On the flip side of the B58 vs S58 is that the purpose of the modifications are to allow the motor to be beat upon for extended periods of time. The goal was not provide the end user with means to increase output, though that is a natural byproduct. So if we look at it purely from the perspective of matching a motor with it's intended use, the the S58 is good match for the M2 platform. If BMW just wants to separate the M2/M4, then the B58/S58 makes a lot of sense. I'm sure the added cost of the S58 vs B58 would be seen as a worthwhile upcharge in the community.
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