This has been a big question for me. Except for the M features, the interiors and options are identical. So performance and driving dynamics are the reason for the upgrade, and does that justify the expense for strictly a daily driver? The M3C is still on my list, but I’ve had my M340i RWD for going on 2 years and not sure if it will make much of a difference for daily driving. I’ve read the instant responsiveness of the twin-scroll B58 is superior to the twin turbo S58 for throttle and go situations. I suppose I’ll be needing a test drive to figure it out. lots of options to consider.
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