Your 6.7 Cummins requires a lot of air! And sometimes the parts that came on the truck from the factory aren't designed for peak optimization of performance, they instead are designed for manufacturing efficiency. The Banks Ramair intake replaces the factory intake with a part designed specifically and exclusively for airflow and power increases giving you 936 CFM or a 122% airflow increase over stock while keeping 50 States legal. Those are gains you'll notice from the moment you fire the truck up!
The biggest thing that sets the Ram Air intake apart from the rest is that it comes with a #1 fuel line relocation kit so that it doesn't sacrifice any airflow to the engine, whereas other intakes will design their intake to sacrifice airflow by working around the fuel line. This gives the Banks intake a clear and distinct advantage over the rest of them!