I am not expert in autofoam but logically thinking. Car manufacturer spend a lot of R&D in fine tuning their cars for stability and cornering. So by default, out of the factory, the cars are tuned to best spec possible from manufacturer. By adding those foam, you are compromising the integrity of the vehicle and might actually more harm than good. Therefore, for me it installing autofoam, need to make sure the installer knows what he is doing. Different cars might need to use different way of installing autofoam. Just my 2 cents.