The nose, pharynx, larynx, trachea and bronchi all work like a system of pipes through which the air is funnelled down into our lungs. There, in very small air sacs called alveoli, oxygen is brought into the bloodstream and carbon dioxide is pushed from the blood out into the air.
And, just to clarify, the kitty litter in your trunk, to be used for traction, needs to be taken out and spread around your tires. Most cars are front wheel drive, so the extra weight alone in the back ain't gonna do you much good.
Avoid placing litter boxes in the corner of a closet or someplace tight, such as between the toilet and bathtub. Your kitty may feel that there's no escape route from such a vulnerable position. Try placing boxes in several different locations. The cat will use the box in the spot where he or she feels the safest.