The B48 was launched in 2014 for MINI and 2015 for BMW. The B48 is not that untested. The engine is new to the 330.
Another advantage of the 340 vs 330 there are additional standard equipment items not just a larger engine. Depending on what you might select as options on a new vehicle there might not be much price difference.
Examples:
M-sport package
Moon roof
HK Sound System
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