Did anyone ever tried beefing up the window seals? There are some videos on youtube for Accord 2013-15 where people used foam + 3M tape and are claiming it made a lot of difference. Mazda6 seems to suffer a similar problem and it sounds like air is leaking between the windows
As luck would have it I drove by a Mazda dealership today. No one had heard of noise complaints! However there is a TSB, No. 09-024/18 covering 2014-2016 and some 2017 models. Mazda is only covering under the limited new vehicle warranty which is 3/36k.
"Some vehicles may exhibit wind noise at rear door quarter glass when driven at high speed. This is caused by air leakage from the gap between rear sash molding, rear door glass run channel, rear door glass guide, and rear door quarter glass guide.
Replace the rear door quarter glass guide, rear door glass guide, and the rar door glass run channel at affected side(s) with modified ones on MGSS (REAR DOOR QUARTER GLASS REMOVAL/INSTALLATION)."
GHK1-72-651E is RH rear door quarter glass guide
GHK1-73-6515 is LH
GHK1-72-602B is rear door glass guide
GRT6-72-605A is RH rear door glass run channel
GRT6-73-605A is LH.
I was quoted 193.15 for all part before tax. TSB labor for one door .05 for two .08 hours.