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I have a hard time seeing that the Dinan Sport caused this issue seeing that over 10000 miles passed without an issue after it was removed. Not until 4000 miles of using the BM3 did the catastrophic issue happen and prior to that event, a super knock issue occurred, breaking the spark plug. It sounds like there could be an injector issue, but these cars are quite sensitive to issues with injectors. I think the likely scenario is the fuel pump crashing under high/heavy load on a hot day and causing a lean condition and ultimately a very dangerous knock event. All it takes is a major event over the course of less than a second to destroy a piston and/or rod bearing.
We know the N55 in M2 is already pushing near it's a fuel pump limits in stock form. We also know that the fuel pump starts crashing near 400whp. It could simply be that this fuel pump was a bit weak or the perfect set of unfortunate circumstances occurred.
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The forest was shrinking, but the Trees kept voting for the Axe, for the Axe was clever and convinced the Trees that because his handle was made of wood, he was one of them.
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