Apart from the fact that I did check the before part, I'm currently waiting on finishing up the firewall, dash and roof with the ccf ( all of these parts are already covered with sound deadeners ). Once that is done, I'll check the after. Using the same app, tyres, road and speed with no changes to the car. I have a professional mic on its way so let's see if I can even utilise that
This car is on its second set of oe general tires. These are truly not the best but back in 2019, a newer corolla was having its tires changed and I got these for free from the owner. With the current setup and tires, I just travelled from isb to lahore and back again and even without having to measure anything, the ambient noise inside the cabin has drastically changed. We drove a similar 2018 gli in lahore for comparison (same road, same speed, 2 occupants etc etc) and it was pretty noticiable how much quiter the cabin was in this car.
I still think that a layer of mlv would further help in ensuring a quiter cabin but that's for another time