Update: I got my 18" tires ordered at Costco today and they now have the stock tires with acoustic tech.
I'm just sharing what I found out today about replacing tires on my Model 3.
I was going to buy replacement tires from Costco since my tires are almost worn out (3/32 @17
.5K miles). Costco has a deal going on Michelins $70 off a set of 4 tires and 1cent installation. Everything looked great UNTIL I found out that the part numbers sold at Costco do not come with the Acoustic Tech.
Stock 18" Michelin MXM4 on the Model 3s come with Acoustic Tech ( https://www.michelinman.com/US/en/why-michelin/michelin-acoustic-technology.html
However, there are 4 different manufactures part numbers for Primacy MXM4 tires: 14644, 34445, 70631 and 16144. Of these, only part# 16144 has acoustic technology.
Unless you talk to the representatives at Michelin, there is no easy way to differentiate these tires from their printed specs.
And Costco does not carry 16144 (bummer for me) [Update Costco now has this tire]