Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit in Gloss Black Part Number 29400440 for RH975 R and H975S

The Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit in Gloss Black (Part Number 29400440) is a premium performance intake upgrade designed specifically for the RH975 R and RH975S Nightstar models. Engineered and manufactured by Harley-Davidson, this air cleaner kit is built to enhance both the performance and visual presence of your Nightstar cruiser, offering riders a compelling blend of function and form.

At its essence, this Heavy Breather Air Cleaner Kit is all about improving engine airflow. The factory intake systems on many motorcycles—including the Nightstar—tend to be somewhat restrictive by design, prioritizing emissions compliance and broad usability over maximum airflow. The Screamin’ Eagle Heavy Breather is a performance-oriented solution that changes that paradigm by allowing significantly more air to enter the engine. More airflow means a more efficient combustion process, improved throttle response, and greater potential power delivery, especially when combined with proper tuning. Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit in Gloss Black Part Number 29400440 for RH975 R and H975S

Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit in Gloss Black Part Number 29400440 for RH975 R and H975S

One of the most important advantages of this kit is that it is a genuine Harley-Davidson part, designed, tested, and validated to meet the company’s exacting standards. Unlike many aftermarket alternatives, which can suffer from poor fitment or questionable engineering, this Screamin’ Eagle kit integrates seamlessly with the Nightstar’s existing components. That means reliability you can trust, plus confidence that you’re installing a product crafted by the same people who design the bikes themselves. Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit in Gloss Black Part Number 29400440 for RH975 R and H975S

The glossy black finish of this Heavy Breather Kit also makes a bold visual statement. Its dark, sleek appearance complements the Nightstar’s aesthetic, enhancing the look of the engine bay while avoiding the excess shine that can clash with a blacked-out or minimalist cruiser theme. The gloss black housing serves as a striking accent that integrates nicely with both stock and custom Nightstar builds. The Screamin’ Eagle branding subtly indicates performance intent without overpowering the bike’s design—making it ideal for riders who want enhancements that look as good as they perform. Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit in Gloss Black Part Number 29400440 for RH975 R and H975S

Performance improvements with this air cleaner kit are often noticeable immediately after installation. Riders typically report enhanced throttle responsiveness, particularly at low and mid-range RPMs—exactly where most cruiser engines spend the majority of their time. This increased responsiveness creates a more engaging, dynamic feel when accelerating from stoplights, navigating city streets, or twisting up country roads. While exact gains vary depending on individual bike setups and whether additional tuning is performed, the overall improvement in engine breathing is significant compared to stock. Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit in Gloss Black Part Number 29400440 for RH975 R and H975S

To make the most of the Screamin’ Eagle Heavy Breather, many riders opt to pair the installation with a compatible fuel management tune or calibration. Because the air cleaner increases airflow into the combustion chamber, optimizing the air-fuel ratio via the engine control unit (ECU) ensures you’re getting the full performance benefit without running lean. Professional tuners and performance advisors often recommend this step as part of a complete intake upgrade to ensure the engine runs smoothly and performs reliably across all operating conditions. Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit in Gloss Black Part Number 29400440 for RH975 R and H975S

Durability and long-term performance are also key attributes of this kit. The Screamin’ Eagle Heavy Breather Air Cleaner uses a high-quality filter media that balances maximum airflow with effective filtration. This means the engine stays protected from dust, debris, and contaminants while maintaining unrestricted air intake. The construction is robust and built to handle the rigors of regular riding, long highway cruises, and the varied environments that riders encounter throughout the year. Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit in Gloss Black Part Number 29400440 for RH975 R and H975S

Installation is relatively straightforward for anyone familiar with basic motorcycle maintenance. The kit replaces the stock air cleaner assembly using existing mounting points, and all components are designed for precise fitment on the Nightstar RH975 R and RH975S models. While installation does not typically require extensive mechanical experience, it’s always wise to follow the service manual’s torque specifications and guidelines to ensure secure assembly. Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit in Gloss Black Part Number 29400440 for RH975 R and H975S

The Screamin’ Eagle Nightstar Heavy Breather Air Cleaner Kit is ideal for riders who care about both performance and appearance. Whether you’re customizing your Nightstar for show, seeking improved throttle feel and power delivery on long rides, or simply replacing the stock intake with a higher-flow, high-quality unit, this kit delivers measurable upgrades. It’s a thoughtful blend of engineering excellence, aesthetic flair, and real-world performance gains. Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit in Gloss Black Part Number 29400440 for RH975 R and H975S

In summary, the Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit (Part Number 29400440) offers increased airflow, enhanced throttle response, and eye-catching gloss black styling for RH975 R and RH975S motorcycles. Built with OEM precision and backed by Screamin’ Eagle performance heritage, it’s a worthy upgrade for riders who want both looks and performance from their cruiser. Screamin’ Eagle Genuine Harley-Davidson Nightstar Heavy Breather Air Cleaner Kit in Gloss Black Part Number 29400440 for RH975 R and H975S