K&N High Performance Oil Filter - KN-171C

The K&N KN-171C is the premium Chrome version of the filter we just discussed. Mechanically, it is identical to the KN-171B, but it features a high-luster finish designed to match the chrome aesthetics of Harley-Davidson and custom cruiser engines.

Key Specifications

• Finish: Chrome (Mirror-like finish for high-visibility placement).

• Media Type: High-flow synthetic blend (traps 99% of contaminants).

• Anti-Drainback Valve: Yes (Nitrile rubber).

• PSI Relief Valve: Integrated to prevent oil starvation in cold starts or high-pressure situations.

• 17mm Nut: Chrome-plated, pre-drilled for safety wire—perfect for easy removal without scratching the finish with a strap wrench.

Fitment Guide

This is the standard high-performance chrome filter for the vast majority of Harley-Davidson motorcycles from the late 1980s through the current Milwaukee-Eight (M8) models.

• Touring: Street Glide, Road Glide, Road King, Ultra Classic.

• Softail: Fat Boy, Heritage Classic, Slim, Breakout.

• Dyna: Street Bob, Low Rider, Wide Glide.

• Sportster: Iron 883, Forty-Eight, 1200 Custom.

• Buell: Most air-cooled models (S1, M2, X1).

Comparison: 171B vs. 171C

Installation Tip

When installing the KN-171C, since it is chrome, avoid using a standard metal wrench or socket directly on the nut if you want to keep it pristine. Use a six-point socket or place a thin piece of plastic/cloth between the wrench and the nut to prevent marring the chrome finish.

Pro Tip: Always pre-fill the filter with a little fresh oil before spinning it on. On a large V-Twin, this reduces the "dry" time before oil pressure registers on your gauge.