P.i. Performance Improver Gasoline Additive

• Restores up to 14% horsepower1• Reduces need for costly higher-octane fuel• Reduces noise from carbon rap and pre-ignition• Controls pre-ignition "knock" AMSOIL P.i. is a potent, deep-cleaning gasoline performance improver featuring concentrated detergents that aggressively clean stubborn, power robbing deposits from injectors, valves and combustion chambers. P.i. cleans your entire fuel system and restores up to 14% horsepower1 in one tank of gasoline. The P.i. bottle is fully compatible with the capless fuel systems of modern vehicles for easy application.