Been to this Bentley shop @ Biz Avenue opposite jusco. Just by looking at the items they stock, can't believe this shop can sell actually. But then greeted by a friendly guy named Jimmy, chat a bit even received free consultation on audio setup, where he recommended to do soundproofing first before moving into audio.
Then he showed some of the cars he currently he's working on inside the shop, and from there can confirm that this guy really know what he is talking about. There was 1 stock Myvi waiting for FLUX audio components to arrive sitting there & when asked, the lady owner already confirmed more than 20k audio setup for 50k Myvi
For soundproofing, he quoted around 4k for proper treatment for audio. Saw some STEALTH materials lying on the floor and he did propose autofoam on pillars & door sill as well as fender treatment using STP (MASTIC I guess
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Yep, that Kevin guys offers two type of foam, hard for increase rigidity and soft for comfort / soundproof only.