Engine upgrades refer to modifications made to a vehicle's engine to improve its performance, efficiency, or reliability. These upgrades can include enhancements like a turbocharger, which increases power by forcing more air into the engine, or a cold air intake, which allows the engine to breathe better and improve fuel combustion. Additionally, engine upgrades may involve changing components such as fuel injectors or exhaust systems to optimize fuel delivery and exhaust flow. These modifications can lead to better acceleration, increased horsepower, and improved fuel economy, making the vehicle more enjoyable to drive and potentially more cost-effective over time.