Screamin’ Eagle® Extreme Flow Air Cleaner Kits allow free breathing and unobstructed airflow to your Milwaukee-Eight® engine. Your engine gets more air, and you can feel more power throughout the rev range. v

• Black finish

• Extreme open-face design and K&N washable oiled-cotton filter for maximum air flow in the iconic performance style of the Milwaukee-Eight® Wedge shape

• Designed to flow 22% more air than a traditional air cleaner and eliminates the air cleaner cover. Designed to feed a large displacement engine enough clean air that can support output of over 150hp

• Specifically engineered to work on the massive Screamin’ Eagle 68mm throttle body found on Stage IV products, but it will also work on the factory equipped throttle body

• Standard rain sock keeps water, dust, and debris from contacting your air filter – extra insurance when riding in the elements

• Save money over the long run – wash and re-oil this filter instead of buying replacement filters using K&N Air Filter Care Service Kit P/N 99850-92T

• All models require ECM calibration with Screamin’ Eagle Pro Street Tuner for proper installation Harley-Davidson Screamin Eagle Air Cleaner – Extreme Wedge 29400459

Details

Fits ’23-later FLHXSE, FLTRXSE, ’24-later FLHX and FLTRX models

Harley-Davidson Screamin Eagle Air Cleaner – Extreme Wedge 29400459

The Harley‑Davidson Screamin’ Eagle Air Cleaner – Extreme Wedge (Part # 29400459) is a high‑performance air cleaner kit designed to dramatically improve the breathing ability of Milwaukee‑Eight engines, giving riders more power, better throttle response, and an aggressive, custom look. (Harley-Davidson) Harley-Davidson Screamin Eagle Air Cleaner – Extreme Wedge 29400459

This air cleaner features an extreme open‑face design built around a high‑flow K&N washable oiled‑cotton filter that maximizes airflow into the engine while filtering out contaminants. Its unique wedge‑shaped filter and open intake style are engineered to flow about 22 % more air compared to traditional stock air cleaners, and the design eliminates the conventional air cleaner cover for freer airflow. It’s capable of supplying the large displacement Milwaukee‑Eight engine with enough clean air to support power outputs in excess of 150 hp, especially when paired with other performance upgrades. (Harley-Davidson) Harley-Davidson Screamin Eagle Air Cleaner – Extreme Wedge 29400459

Construction is tailored for both function and durability, with a black finish that enhances the aggressive look of your bike’s engine area while resisting corrosion and wear over time. The unit also includes a standard rain sock, which protects the filter from water, dust, and debris when riding in less‑than‑ideal weather conditions — an important feature if you ride regularly in wet or dusty environments. (Harley-Davidson) Harley-Davidson Screamin Eagle Air Cleaner – Extreme Wedge 29400459

Installation requires some attention to detail: because this is a performance‑oriented component, Harley‑Davidson specifies that an ECM calibration with the Screamin’ Eagle Pro Street Tuner is needed to properly adjust your engine’s fuel and ignition maps to match the increased airflow. Without proper calibration, the engine’s performance gains may not be fully realized, and in some cases running an engine with mismatched air/fuel ratios can lead to reduced efficiency or other issues. (Harley-Davidson) Harley-Davidson Screamin Eagle Air Cleaner – Extreme Wedge 29400459

Designed to fit select Milwaukee‑Eight touring and Softail models from recent years (2023–2025, depending on the bike), this kit does not fit California‑compliant models due to emissions restrictions. It’s a Stage I upgrade that pairs well with other performance upgrades such as exhaust systems and tuners, offering both riders who want a performance boost and those seeking a more distinctive visual upgrade a meaningful improvement over the stock air cleaner. (Harley-Davidson) Harley-Davidson Screamin Eagle Air Cleaner – Extreme Wedge 29400459