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Air Intake Ford F-450 6.4L DSL 08-10 57 Series Generation II Air Intake Kit 57-2576 by KN. This kit improves airflow into your engine. It includes a KN air filter and a custom designed air intake tube. The KN filter increases the airflow and the intake tube smoothes that airflow into the engine. The result is more horsepower and torque and better acceleration you can feel. Estimated Horsepower Gain 16.4 HP - 2600 RPM. Street legal in all States.