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I would expect a 335 with an N55tu or similar soon. Starting with the E46, there's been at least one launch engine which was eventually superceded early in the generation. See the 328i vs. 330i in the E46 generation, E90 325i and 330i only available for one year in the US etc. I wouldn't expect the N20 to change much but I would think the 335 will get something soon.
That said, the 335 is still significantly quicker. Car and Driver got a 13.7 at 103 out of one, which is about a buslength in the 1/4 mile. That big of a power difference might not make the car more fun to drive but it's certainly faster around a racetrack.
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