Fuel filter deletes are designed to replace the stock fuel filter with a higher-flowing unit. This can improve engine performance, especially when combined with other modifications that increase airflow or fuel delivery. However, it is important to note that fuel filter deletes may also remove some of the filtration capabilities of the stock system, which could lead to increased engine wear. Additionally, fuel filter deletes may not be legal for use on all vehicles, so it is important to check with local regulations before installing one.