Yo bro. here is my late review of the chassis foam - undercarriage + A pillars on my old faithful Iswara aeroback.

So after foaming, I drove it back home, then went for holiday, didn't touch my Iswara for nearly 2 weeks. After getting back to KL, was surprised to feel improvements in road noise levels. The sound characteristic seems to have changed, not so 'rough' sounding as before, much more tolerable. Wind noise reduction not major but got some slight improvement. Overall, very good product, old car like mine also can feel better!