One of the things that should come with New Year's Resolution Lists... or other lists for important things to accomplish for that year is having your car checked and tuned up.
Setting an amount and saving for it the whole year should also cover replacements and maintenance of performance parts as well as oil change, tire/spare tire changes, shocks reconditioning, beautification (our car's dashboard needs a facelift), even the regular shampoo and waxing a car requires.
Investing in your car doesn't really mean expensive leather seats and high-end speakers. It simply means making sure your car is properly maintained so it can perform at peak performance. It means your safety and may even spell the difference between a long and short life.
Avoid accidents and hassles and stress. Set dates and allowance for your car.