Performance upgrades refer to modifications made to a vehicle or machine to enhance its efficiency, speed, or overall functionality. These upgrades can include improvements to the engine, transmission, suspension, or exhaust systems, allowing for better acceleration, handling, and fuel economy. Common examples of performance upgrades are installing a cold air intake for improved airflow, adding a turbocharger for increased power, or upgrading the brakes for better stopping performance. These enhancements can lead to a more enjoyable driving experience and may also increase the vehicle's resale value.