The K&N 57-3100 is a 57 Series FIPK kit for the Cadillac ATS L4-2.0L F/I turbo, 2016-2017. It is built around a roto-molded HDPE intake tube paired with an oversized oiled cotton air filter, and it replaces the factory air filter and intake tube. The manufacturer lists an estimated gain of 19.75 HP @ 3742 RPM, and the kit carries a No-Hassle Lifetime Limited Warranty. Owners on user forums often start with a drop-in filter as a budget step, but that leaves the stock tube in place, so this full replacement is the more complete upgrade.
Per the manufacturer, this kit targets the 2016-2017 ATS with the 2.0L turbo four-cylinder, so buyers should confirm trim and VIN before ordering because details vary across sources. Typical installation can be completed in 60 minutes or less with simple hand tools. Owners on user forums advise removing the emissions hose from the intake tube and working the clamps at the airbox and turbo, and they note that cold hoses are less pliable and will not flex quite as much, so working while the engine is warm helps.
The manufacturer states the filter only requires cleaning about every 100,000 miles under normal highway driving conditions.
The manufacturer lists RU-5163XD as the replacement filter for this kit.
The manufacturer lists CARB EO number D-269-81 for this kit. Check that number against CARB's listings if you live in a CARB-adopting state.
The manufacturer rates installation at about an hour or less with basic hand tools, which makes this a reasonable weekend job for a DIYer comfortable with clamps and hoses. Owners on user forums recommend disconnecting the emissions hose before pulling the stock tube, then working the clamps at the airbox and turbo. Since the stock hoses stiffen when cold, do the swap while the engine is still warm, and check that the new tube seats fully on the throttle body and airbox connections before tightening the clamps.
