I'm ordering my m40 tomorrow! I've been debating between getting the M-diff or not. I realized they remove the all seasons forcing the high performance tires on. Can one replace the tires with all-seasons after the fact? Someone mentioned on another post BMW advises against having all seasons with the M-diff. I have two sets for my 340 and really hate changing the tires.
If not, will I regret not getting the M-diff?
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