Outflows stock up to 50 Percent. Reduces exhaust gas temps (EGTs). Exclusive 4 - 12 inch bellows to accommodate engine movement. Enclosed housing keeps out hot, power - robbing engine air. Easy filter access for monitoring cleaning. Add the optional Super - Scoop (42190) and ram cold air for more power. Testing, testing more testing. Banks Ram - Air Intake Systems are tested and proven. They start out as CAD software prototypes and are put through flow simulations. After a hardware prototype is made, it's tested on a flowbench. Then it's tested on the vehicle. And finally, Banks' density - tests the Ram - Air against stock and many competitors. Proven design. Proven performance. Banks Ram - Air Intake maximizes the flow of cool, dense air to the engine for greater power and fuel economy. Thanks to its enclosed cold - air housing, huge inlet with giant dome - shaped filter, and streamlined internal design, it flows 50 better than stock Infact, it performs so well that it delivers greater air density to the turbo's inlet than all competitors tested. Add on the optional Super - Scoop (42190 for standard bumper or 42191 for painted bumper), and the results are even better Longer service life, too. An aftermarket exclusive with 4 - 12 bellows, Banks Ram - Air accommodates engine movement, which protects the components and extends service life. What's more, Ram - Air is designed to not cause fault or error codes. It's all about density. And Banks Ram - Air Intake delivers. The harder you work your truck, the more Banks Ram - Air Intake improves power and fuel economy