I tried foaming on my 2nd gen vios. Not from Desmond though but from another lowyat advertiser near pheonix plaza last time. Can't find his thread d. I can feel the chasis stiffer. Car more stable. I just do under carriage only. Quite satisfied n cheaper then autofoam brand. Soundproofing is 0 percent improvement. Stiffness yes, after few days even more stiff