The K&N 57-1137S is a silver FIPK performance intake for Harley-Davidson Softail and Dyna models with fuel injection. The K&N 57-1137S performance air intake contains a custom rotationally-molded tube and a large filter to provide a guaranteed increase in horsepower. Compared with the factory airbox, the kit's aluminum tube and high-flow element are designed to move more air into the throttle body, and the manufacturer's horsepower-gain guarantee is the main reason to pay this price rather than a basic filter swap. Because no dyno figure was confirmed by the manufacturer, buyers should treat the gain as a manufacturer claim rather than a measured number.
Buyers searching for a Softail Dyna FI cold air intake, a Twin Cam fuel-injected intake upgrade, or a Dyna Low Rider air intake will find this kit's aggressive appearance is part of the pitch alongside its airflow. The silver finish and cast aluminum tube give it a visible upgrade over the stock setup, and the system is sold as a complete kit rather than a loose filter. Fitment is the critical check: the manufacturer lists the kit under 2001-2017 Softail/Dyna FI, but its model-level chart excludes lower fairings on the listed bikes, so match your exact model and year before ordering.
The manufacturer lists the kit for 2001-2017 Softail and Dyna FI models. Its model-level application chart excludes lower-fairing models, and application lists can vary by submodel, so confirm your exact model and year with the manufacturer before ordering.
The kit replaces the factory air cleaner. The manufacturer describes it as a cast aluminum intake tube paired with a high-flow K&N filter element.
