*update
cut the insuflex according to the plastic door frame..
I do quite ugly for the boot part

but when I open the plastic part at the side of the car boot I stick properly hehe
this is whr I do my HU + speaker change at Brothers Puchong. Quite reasonable price.

Kenwood
Last but not least JVC speaker for the front side of my car.
Dayum!
Overall my opinion:
1. Important to do soundproofing. The effect is fantastic. We don't need to drive Japanese car to feel comfort and quietness. Just need to make effort to self DIY and soundproof the car. Now my car is so quiet you know? I nvr do floor also so quiet. If want do the floor to me waste of time unless the road u use is very lousy. Must do the bonnet to insulate engine noise, do the doors to reduce sound from outside, do the roof to insulate heat from sun (I don't feel hot anymore cause usually I can feel the sun is penetrating the roof and attack me

, last but not least the boot space to reduce the noisy sound from the back.
Material get from ?
2. Change new floor mat. Quite good. I get the very thick mat and it covers the whole floor of my car (that's why I dun reli need the floor insulation cz the floor mat itself is very thick). Can prevent the floor from getting dirty. I got this one for RM130.
3. Put in new audio player. Upon changing, my back speaker suddenly play music so well. I was amazed. Looks like Proton stock HU sucks wei. I choose Kenwood cz of sound clarity. If u want bass go for Pioneer HU. The HU with USB should cost less than RM400 while with aux in less than RM300.
4. Speaker. Very good la! I listen to the music hor, I dun feel like leaving the car anymore! The bad effect is the playback from radio is suck that make the speaker have crack sound. Use USB or Aux in cable once you upgrade ur HU !
5. Last but not least, the tinting. If u nvr tint ur car sure hot till kao lat. My tinting is RM160 from SolarTint shop for RM160. keke

That's all the upgrade I done for now.
I duno what to upgrade anymore as I am modifying my car more to comfort rather than performance and outlook.
Any upgrades u guys can share?