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Just caught up reading all the responses on this thread, just want to clear up some questions and concerns:
The B46D is in all 330’s in NA, including my very own after checking the VIN. The quality of the B46D is the same as the B58, same compression ratio, same cylinder bore diameter, etc. The only difference is that it has SULEV parts installed on it in order to meet emissions requirements. The upgraded B48TU is used for stock 300+hp vehicles produced by BMW. This upgraded engine is made to push 300hp even while running lower than 91/93 octane. It is made so that while running low octane, the engine will still be able to make the same power. We can see this because of the lower compression ratio which is found on the engine. It has very little to do with reliability of engine, it has everything to do with gas quality, however.
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