There’s nothing wrong with holding on to an old car, racking up miles on the odometer and forming a connection with it. After a few thousand miles, though, no one would blame you if you felt like you wanted something more — more power, better handling, a smoother ride. That doesn’t mean you need to trade up. No, you’ve spent too much time breaking in the groove in the driver’s seat, and you’ve adjusted it enough times to get it right where you want it. Save the cash and save yourself the separation anxiety, and refresh your old ride with a few upgrades that are affordable and, in some cases, easy enough to install in your own garage with standard tools.
Fresh Tires

If you want your car to handle better, the place to start is a good set of tires. Power and performance are good, but if you don’t have the grip from quality rubber to translate that to the road, it’s all for nothing.
Good: Falken Azansis $97+
Better: Bridgestone Potenza $100+
Best: Michelin Pilot Super Sport $153+
New Spark Plugs

Spark plugs can be easy to overlook, but new, better spark plugs are an easy, affordable swap that can make all the difference. The better the quality of the spark, the better combustion, which translates to more power and better fuel economy. (Here’s a complete rundown on how to check them.)
Good: Bosch Double Iridium Spark Plugs $5+
Better: NGK Iridium IX $5+
Best: Denso Iridium Racing $28+