I have had M235i for a couple of weeks and the engine in Comfort or Sport modes is making a booming noise when under light load between 2000 and 3000rpm. It can be annoying depending on my mood. My M235i has 6-speed manual, it should be quieter with 8-speed auto because of more ratios. Regardless, I think a regular non M-Sport 435i should be a better cruiser.
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