The K&N 77-3101KP is a 77 Series performance intake built for the 6.6L Duramax L5P V8 turbo diesel in 2017-2019 Chevrolet Silverado 2500HD and 3500HD trucks. It is a high-flow cold air intake with an aluminum tube, sold as a replacement for the factory air intake system. A mandrel-bent aluminum tube feeds an oversized oiled cotton filter, and the kit replaces both the factory air filter and the intake tube. Stock intakes are restrictive and sound muffled, so this is a meaningful upgrade for towing and throttle response.
The manufacturer lists an estimated horsepower gain of 15.22 HP @ 2500 RPM and an estimated torque gain of 33 lbft. These are estimates, so actual results depend on tuning and conditions. The cotton-gauze filter is washable and reusable, which can cut the recurring cost of disposable paper filters over the life of the truck. The manufacturer says the filter needs cleaning only every 100,000 miles under normal highway driving. The replacement element is listed as RU-5179. Buyers searching for a 6.6L Duramax cold air intake, a 2017-2019 Silverado 2500HD intake, or a washable oiled cotton air filter will find this kit matches those needs.
The manufacturer lists this kit for 2017-2019 Chevrolet Silverado 2500HD and 3500HD trucks with the 6.6L V8 diesel. Other model years are not listed for this part number.
The manufacturer recommends that customers do not discard the factory air intake system, so it is worth storing it in case you need to return the truck to stock.
The manufacturer states that the filter element requires cleaning every 100,000 miles under normal highway driving conditions.
The manufacturer rates a typical installation at 60 minutes or less with simple hand tools. The install sheet calls for a flat-blade screwdriver, a ratchet with extension, 10mm and 13mm deep sockets, 3mm and 4mm Allen keys, and a T20 Torx bit. The job involves removing the intake plenum, loosening the clamps on the intake tube, disconnecting the mass air sensor and coolant bypass hose, and moving the sensor into the new K&N tube with the supplied hardware. The manufacturer warns that skipping steps or using non-supplied hardware can damage the tube, throttle body, or engine. Listen for air leaks after installation and tighten any loose hose connections before a road test.
