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Originally Posted by Live4USMC
Is there a big difference in performance between the 335 and 340?
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Glad everyone is OK, first of all.
I had both, a 2015 335ix and now a 2017 340ix. The 335i (N55) had much more turbo lag and the power is higher up in the rev range. The 340i (B58) has much less turbo lag and the power comes on much sooner and feels like it's endless. The 340i has more torque down low and is better suited for city driving, IMHO and from my personal experience.
Additionally, the 340i comes matched with an updated ZF automatic transmission that is beefier to handle the additional power and has a wider gear ratio spread for slightly better fuel economy.
I definitely recommend you drive one at your dealer to feel the improvements that were made.