Turbo heatshields are used to protect the turbocharger from excessive heat generated by the engine. 

The heat generated by the engine can cause damage to the turbocharger, reducing its efficiency and lifespan. The turbo heatshield is designed to reflect the heat away from the turbocharger, keeping it at a safe operating temperature. 

This can improve the performance and reliability of the turbocharger, and ultimately the engine.