Banks Ram-Air Intake System Oiled FilterIntroducing Banks Ram Air Intake System. Add an additional +20 hp to your 2017+ Duramax. Or, combine with the Derringer inline tuner for a total gain of 81 hp. Beats stock and the competition. New over sized filter element, largest in its class, protects engine and outflows competition. Enclosed housing keeps out hot, power robbing engine air. More airflow increases the air fuel ratio allowing the engine to run more lean, reducing soot output,