There are many different performance mods that can be done to improve a car's performance. Here are a few of the most popular: 1. Tuning: Tuning a car usually involves modifying the engine, transmission, and other mechanical components in order to make it run faster and smoother. 2. Exhaust Systems: By increasing the amount of air that is allowed to flow through the exhaust system, you can boost performance and acceleration. 3. Performance Tyres: Increased grip and cornering ability can be achieved by using performance tyres on a car. 4. Performance Brakes: By adjusting the braking system, you can make the car stop faster and more smoothly.