Banks Ram-Air Big-Ass Dry Cold Air Intake System - Banks Power - 42297-D

Key Features
The only intake system that improves mass air flow over stock
Improves turbo response
Improves fuel economy
Big Ass™ Filter extends service life, requires fewer cleanings
Includes Banks Air Mass Control Module
Includes Banks Crankcase Ventilation Control Module
Enclosed housing keeps out hot air
Oversized housing increases air volume around filter
Connects to OEM hood scoop and forward ram-air scoop
Unique rubber elbow allow for engine movement
More audible induction sound
Oiled Air or Dry Filter Element
No Check Engine Light
U.S. Patent 11,193,441
Helps engine produce horsepower at lower RPM
Thanks to a 45% reduction in pressure loss over the stock intake, air mass is increased into the turbo inlet. This denser air makes the turbo's job easier. Turbo lag is reduced and boost comes on sooner, widening the engine's working RPM range.
 
Wheel Horsepower
Wheel Torque
Not only does power come on sooner with the Ram-Air intake, but the turbo spins nearly 3,000 RPM slower increasing its efficiency and longevity. Turbo life is increased because it’s spinning millions of revolutions less over its lifetime.
 
Patented Electronics
The ECM (Engine Control Module) in your 2025-26 Duramax monitors air mass and pressure so closely that any deviation from stock results in a check engine light. The truck's ultra-stringent ECM even monitors variations in crankcase ventilation pressure as another trigger for a trouble code.
 
To overcome these new limitations, we employ our patented  Banks Air Mass Control Module,  which corrects for the increase in mass air flow to the turbo's compressor.   To overcome changes in pressure sensed by the crankcase pressure sensor we developed the  Crankcase Ventilation Control Module,  which installs inline with the CCV circuit. This proprietary and patented module processes and recalibrates crankcase pressure data, allowing the intake to outflow stock while keeping the ECM happy.
—U.S. Patent 11,193,441
Massive Airflow
In other words, all other competitive intakes must flow within a narrow airflow window near stock levels past the Mass Air Flow sensor, whereas these stock airflow design constraints do not limit us.
 
Unrivaled Size and Capacity
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 filter has greater dust capacity giving you more miles between services and 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.
Your Stock Intake is Restrictive
The Duramax OEM air filter housing is a bulky multi-piece design with harsh bends, corners and is designed for dust collection, not performance. The air path is compromised by resonators and silencers in an effort to keep noise at a minimum.
 
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 and drag to the intake system lowering Mass Air Flow.
 
The Devil's in the Details
The new Banks Ram-Air system features a durable heat-resistant Cross-Linked Polyethylene enclosure with a smooth organic shape that maximizes cool air volume around the filter and maintains air density into the box itself.
 
The top hood scoop duct now dumps directly into the airbox chamber, improving the ram-air effect at speed.
A side fender inlet away from engine heat further lowers the pressure drop in the system while also letting you hear your turbo better
 
Exclusive Bellows Free Performance
Standard factory style bellows induce drag to the intake. This added turbulence affects the boundary layer on the inside of the intake reducing the effective diameter for air to flow through.
 
Banks' huge tapering intake elbow with exclusive bellows slide over the Banks Super-Tube allowing for free engine movement and unobstructed airflow into the turbo.
The elbow is made from EPDM synthetic rubber instead of silicone for greater environmental resistance and strength against damage or collapse under vacuum.
Air Mass Matters
The greater the air mass entering your engine, the less fuel your engine will consume. That also means less engine heat going into the engine oil and coolant system since it is working less hard to make the same horsepower. In other words, improved fuel economy and less stress on the engine itself!
 
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 and more stress on your engine.
Pressurized, cool, dense air is the winning combination. To learn more about air density,  see this article.
A Big Filter — Engineered Right
The Banks Super-Tube fits perfectly over the top of the filter which has an integrated collar to smoothly transition airflow from the air box and into the turbo with the lowest resistance and drag.
 
The massive filter sits angled down in the air box to discourage dirt and debris from getting wedged between the pleats and Its massive 51in2 filter outlet Filter has over twice the airflow area of any competitor.
Bigger is Better When Properly Engineered
While other brands go for bragging rights for the "biggest" by cramming more pleats into their filters, they end up designing one that gets clogged faster and flows less air.
 
Just having a big looking filter, does not mean it will perform the best.
Banks massive 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.
About This Product
The Ram-Air intake system for the 2025-26 Duramax 6.6L widens the powerband, sharpens turbo response, and improves fuel economy by improving air mass flow to the turbo. This is…