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The all-new Ram-Air cold air intake system's large organic shape eliminates all restrictions and turbulence to the turbo. The radical new design allows for a massive 58% gain in Mass Air Flow over the stock system. The oversized Big-Ass filter has greater dust capacity giving you more miles between services. The Big-Ass filter flows freely long after stock and competitors are clogged with debris. The huge filter outlet smoothly tapers down providing the highest gains in air density.
The 2020-22 Duramax OEM Air Box is a bulky multi-piece design with harsh bends and sharp corners. The air path is compromised by resonators and silencers in an effort to keep noise at a minimum. And, while the factory design does have inlets that mate to the hood's air scoop, its square filter, and S-shaped flow path induces turbulence reducing air density.
The new Banks Ram-Air system features a durable heat-resistant enclosure with a smooth organic shape that maximizes cool air volume around the filter while maintaining air velocity into the box itself. The new Big-Ass filter offers greater dust capacity while minimizing flow restriction. A huge tapering intake tube and flexible silicone elbow interface further increase air density and velocity.
The ECM (engine control module) in your 2020-22 Duramax monitors air mass and pressure so closely that any deviation from stock results in a check engine light. This means that competitive aftermarket intakes must flow the same as stock. The new patented Banks Air Mass Control Module allows our engineers to design past this electronic limitation. In other words, we are not limited by stock airflow constraints.
—U.S. Patent #11,193,441
The greater the air mass, the less fuel your engine will consume to make the same horsepower. In other words, fuel economy! Yes, airflow (CFM) is important, but if the system flows more air, and that air is hot, you'll likely see a loss in horsepower. Pressurized, cool, dense air is the winning combination. To learn more about air density, see this article.
With a 51in2 filter outlet, the Ram-Air has an intake tube that has over twice the airflow area of any competitor, and almost 5x larger than the factory intake tube.
Just having a big filter, does not mean it will perform the best. While other brands go for bragging rights for the "biggest filter" and cram more pleats into their filters, they end up designing a filter that gets clogged faster and flows less air. Bigger is only better when designed properly. Our competitors have swung for the fences and whiffed.
The Banks Big-Ass Filter has an optimized ratio of filter surface area, pleat count and media thickness allowing it to outflow every other filter tested while breathing evenly from all sides. Banks wins again.
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