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Enclosed Air Box Intake for Many Chevy Silverado & GMC Sierra 2500/3500 Diesels

The 2018 Chevy Silverado 2500 HD 6.6L

If you own a diesel Chevrolet Silverado or GMC Sierra, you want the power and quality that only a top-tier pickup can provide. Help protect your engine and gain a guaranteed increase in horsepower and torque with the K&N® 63-3101 air intake system, engineered specifically for many diesel Silverado and Sierra models. The K&N® 63-3101 roto-molded air box intake system boasts an estimated power increase of 10.4-horsepower and 19.85 lb./ft. of torque*.


CAD-designed in order to help ensure a precise fit, the 63-3101 is engineered to effectively utilize space in the engine bay and reduce airflow restriction, and an 8-inch conical filter is precisely placed to help ensure exceptional airflow and contaminant capture. The enclosed air box design helps protect the filter and inlet air from the heat of the engine bay.

The enclosed air box design helps protect the filter from high engine bay temperatures


The 63-3101 is designed to help keep engine air cooler, which can increase engine combustion efficiency, and helps provide a smooth, low-restriction path for airflow to the engine. Your engine needs oxygen to create power; the cylinders in your vehicle’s engine have to have air to create the explosion that produces horsepower and torque. Since cold air contains more oxygen molecules than warm air, injecting a higher volume of oxygen-rich air into the cylinders allows the engine to burn fuel more efficiently during combustion—providing an increase in power.


In a typical stock air intake system, air has to pass through a thick, disposable paper filter, and then move through a narrow system of tubing that can cause air to swirl and bec ome turbulent. Excess turbulence causes the molecules within the air to collide, creating heat, which lowers the density of the air and reduces the efficiency of combustion. All K&N intake systems are specifically engineered to help keep your engine air cooler.

“I was happy to find out how easy the install was. Sounds great when you jump on the throttle. Thanks for all your great service.” – Tom from California [Part No. 69-4523TP]


Since engine combustion is most efficient in an oxygen-rich environment, keeping engine air cooler often significantly increases engine combustion efficiency. The 63-3101 intake system features a free-flowing, high-density polyethylene intake tube, which is engineered to reduce turbulence in the air, which helps keep engine air cooler and increases engine performance! The 63-3101 also incorporates an enclosed air box design, which helps protect the air filter and intake air from high temperatures within the engine bay.

“Very easy to install—takes about an hour. Definitely noticed a power improvement when towing my trailer. Well worth the money.” – Paul from Pennsylvania [Part No. 63-6014]


Under normal circumstances, most automotive air filters demonstrate an inverse relationship between airflow and efficiency—the higher the airflow, the less efficient the air filter is at protecting the engine, and vice versa. The oiled design of K&N air filters assists in “absorbing” dirt particles—and in turn helps incorporate those particles into the filter surface itself, which helps maintain the filter’s efficiency and ability to flow air. When tiny particles are captured and saturated with oil, they in turn can become tacky, allowing them to capture other particles.


The High-Flow Air Filter™ included in the 63-3101 intake kit is oversized with a conical shape, providing a greater surface area and allowing for a service interval of up to 100,000 miles between cleanings (under normal highway driving conditions). High-Flow Air Filters feature an oiled, layered design—providing up to 50% more airflow than a traditional paper filter. When your filter does need to be cleaned, you can use the K&N Recharger® Kit (99-5000 or 99-5050) to quickly and easily restore your filter’s performance. Each K&N intake (and filter!) is designed to last for the life of your vehicle.

“Great buy. Before I got it, I was skeptical about it. It makes the truck a little faster and definitely improves the sound when you get into the throttle. Would definitely recommend this product to anyone.” – Derek from Michigan [Part No. 77-3082KP]

A free-flowing HDPE intake tube helps keep engine air cooler


The K&N 63-3101 intake system is engineered to incorporate factory mounting points and the factory mass air sensor. Installation can typically be completed in 90 minutes or less, and requires only simple hand tools. Detailed instructions are included in your kit, and installation videos for many vehicles are available on the K&N website.

Engineered to fit:

• 2019 GMC Sierra 3500 HD 6.6L V8 Diesel Engine

• 2019 GMC Sierra 2500 HD 6.6L V8 Diesel Engine

• 2019 Chevrolet Silverado 3500 HD 6.6L V8 Diesel Engine

• 2019 Chevrolet Silverado 2500 HD 6.6L V8 Diesel Engine

• 2018 GMC Sierra 3500 HD 6.6L V8 Diesel Engine

• 2018 GMC Sierra 2500 HD 6.6L V8 Diesel Engine

• 2018 Chevrolet Silverado 3500 HD 6.6L V8 Diesel Engine

• 2018 Chevrolet Silverado 2500 HD 6.6L V8 Diesel Engine

• 2017 GMC Sierra 3500 HD 6.6L V8 Diesel Engine

• 2017 GMC Sierra 2500 HD 6.6L V8 Diesel Engine

• 2017 Chevrolet Silverado 3500 HD 6.6L V8 Diesel Engine

• 2017 Chevrolet Silverado 2500 HD 6.6L V8 Diesel Engine


Each intake system comes with a 10-Year/Million Mile Limited Warranty. Furthermore, using a K&N replacement air intake system will not void your factory warranty; in the U.S., manufacturers must provide evidence that an aftermarket part is the cause of a necessary repair in order to void or deny warranty coverage. The Consumer Products Warranty Act of 1975 (also known as the Magnuson-Moss Warranty Act) protects consumers’ rights to their warranty coverage.

“Couldn’t be happier with this intake. Easy installation, great sound and noticeable performance. Looks great, sounds great and performs as advertised. Well done K&N.” – Shawn from Raleigh, NC [Part No. 69-8621TTK]


K&N performance air intake systems come with a horsepower guarantee—you will get an increase in horsepower and torque! During dynamometer testing, the 63-3101 provided an estimated power increase of 10.4-horsepower and 19.85 lb./ft. of torque*. View the complete dynamometer sheet here

“Everything that was needed was included in the box. The install was easy, under one hour. It took longer to put the air box together. The engine sounds great and pick up has improved. I am very satisfied with this system. It does make a big difference in driving and puts a big smile on your face.” – G MAN from Mesa, AZ [Part No. 63-1561]

Visit this page to purchase the 63-3101 air intake system, or visit the vehicle search page to explore air intake system options for your vehicle. Join the millions of customers who trust K&N to help them boost performance and protection in their vehicles!

Legal in 49 states. Not legal for sale or use in California on any pollution controlled motor vehicle.


*Horsepower gains vary among products and applications, but each K&N performance air intake system is designed to increase airflow efficiency for specific vehicles and their engines. Each kit undergoes significant testing to help ensure that the filter and intake tube are engineered to deliver large increases in airflow and horsepower. Please visit individual product pages to view horsepower estimates for your specific vehicle.


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