Ok guys, i just ordered soundproofing my GLA. It will happen in 4 weeks
I want to have full soundproofing of my car- doors, floors, ceiling, wheels- generally all what is possible.
To give you idea how it looks like, I found web page where similar soundproofing is presented.
Mercedes GLA (W156) Soundproofing | Car Soundproofing and Noise Insulation Services
Actually as you can on photos- there is very little original factory sound absorbing mats!
Yes, it the reason why GLA is so noisy. We have some kind of flor carpets and that is it. Nothing more.
I was really surprised when I have seen those photos first time.
I am really hoping such full soundproofing will decrease noise significantly, especially during driving on highway.
I talked to garage owner, what noise level drop I can expect- and I was informed it should be about 4dB.
So, if now I am driving 130km/h and noise level is about 69,5 (measured with dedicated noise measure), after soundproofing it would drop to 65,5dB- I will be very happy.
So, fingers crossed