I had asked about sound deadening and tires a ways back, and it seems sound deadening works, but I'm not sure where to put it (I like the lean curb weight of this car). I haven't heard anything about changing tires, however.
I did read in an long term update online that Nissan knows the source of the "higher than normal" noise and that it will be "fixed in future update". But I forgot where I read it from (and my internet connectivity sucks right now). I do recall something about sound insulating an "in-cabin duct" or something like that. Maybe it'll be a TSB?
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