The question is did this teenager's rice burner "customized" with non factory authorized equipment such as undersized tires, oversized wheels, lowering, or whatever which would be a contributory to this fatal accident?
Any such modifications open up the car owner and the shop who performs such modifications to criminal and civil action. Any chassis mods constitute this legal exposure. Do not modify your automobiles as any modifications not approved by Toyota will nullify your warranty and alter the static and dynamic characteristics of your vehicle. While safety, durability, reliability, performance and handling MIGHT be improved with certain mods, it is more likely and next to impossible to prove otherwise.