Testing, testing and 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, its tested on a flowbench. Then its tested on the vehicle. And finally, Banks density-tests the Ram-Air against stock and many competitors. Proven design. Proven performance. Thanks to its enclosed cold-air housing, huge inlet, giant dome-shaped filter and streamlined design, Banks Ram-Air Intake maximizes the flow of cool, dense air to the engine for greater power and fuel economy. It flows 50 percent better than stock-and delivers greater air density to the turbos inlet than the stock system and 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 4-1/2 in. bellows, Banks Ram-Air accommodates engine movement, which protects the components and extends service life. Whats more, Ram-Air is designed to not cause fault or error codes. Its 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!