A man's body is found shredded into pieces on a highway outside of Vegas. His decapitated head is found inside a football helmet, a distance away from the other parts of his body. This gruesome case leads the CSI team to a go-cart track where they discover that a group of teenagers were racing their high powered go-carts down the highway. It turns out the victim was torn apart by an exploding tire from an 18 wheeler during a race. The team recreates the accident by using a ballistics gel man filled with bones.