you need to be firm and clear on what you want and what you're getting.

let me ask you this, to fully sound proof a car typically cost between rm1k to 10k or so.
any "higher segment" car with DECENT STOCK sound proofing cost between 100-300k and beyond not including a long term high interest rate bank loan.

do you need mathematics lessons to calculate which is cheaper?

i sound proof my BLM doors...did not notice much difference...passing motorbike sound maybe reduced 5%

the noisiest part is still from the firewall and tires...

basic car is basic car...upgrade till max, u still cant make the car feel premium...with all the money spent on upgrading, better get a better car from the beginning

here's the thing: NVH improvement can easily exceed a higher segment stock car when done properly.
those jobs will require stripping your car down to the bare metal chassis and slowly apply various materials to them similarly how a luxury car such as BMW/audi/merc would have, and those sorta sound proofing/insulation is definitely not available on supposedly "higher segment" such the 120-160k range c/entry d segment cars.

so what i am saying here is when you are putting down absurd figures (eg: 10k) into sound proofing, you can easily exceed a higher segment (eg: civic/altis being c segment) car despite being a lowly saga.

do look into the matter before starting your hostilities and playing around with various forum colors

kindly share what was done, where was it done, how much was spent

a good sound system is more worth the money