From the data we can assume with a very high likelihood that the new B46B20 and the B58B30 share a lot of similar parts. That means the possibilities for engine building with the new B46B20 is just as vast as the B58B30, at least there will be some parts like forged pistons will be available as well for us B46B20 owners. Also means that reliability of recently updated B46B20 engines are definitely much better, since the B58B30 has shown to be a truly reliable engine, the B46B20 can't be far off if it holds true that the component quality is the same.
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