So I am shopping for CPO cars and one of the recurring themes I hear (no pun intended) revolves around the improved sound deadening of later cars (i.e. they are quieter). Assuming that is true, does anyone have any experience with regard to exactly what that sound deadening might be? Ideally, I would consider "mimicking" what Tesla did in terms of the later "factory" sound deadening (as they would have done the hard work of identifying the noisiest locations). Typically this involves a combination of mass loaded vinyl, butly rubber deadening sheets and "plugging holes". Obviously, if they used something more involved like thicker glass, more welds/metal, that's not going to be replicated by me. As a side note "quieter tires" has typically been the biggest improvement in noise reduction I've seen over the years (i.e. better to STOP the noise than try to "block it" after-the-fact). Thanks!