Carmakers are often tempted to slap a non-functional hood scoop onto a new model, hoping consumers will envision performance capabilities the engine underneath doesn t really have.

It s part of a new air-intake system meant to keep the Duramax diesel engine running at full power more often.

The scoop also takes advantage of a ram-air effect, in which the speed of the truck actually forces more air into the engine.

Engineers simulated every type of precipitation possible, from what Chevy calls monsoon-level downpours, to snow, to ice pellets.

It s all about helping the Silverado HD s Duramax diesel engine breathe easier.

That engine is a 6.6-liter turbocharged V8 that produces 397 horsepower and 765 pound-feet of torque, and is coupled to a six-speed Allison automatic transmission.

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