ARLEN NESS MN-9DFJ Inverted Air Cleaner Kit MN/9DFJ

( Brand: Arlen Ness ), ( Manufacturer Part Number: MN/9DFJ ), ( Color: Black ), ( Compatible Year: 2017 2016 ), ( Compatible Make: Harley Davidson ), ( Compatible Model: Flstf Fat Boy ), ( Bundle Description: 1 Pc Genuine Arlen Ness Inverted Series Air Cleaner Kits ), ( Type: Inverted Series Air Cleaner Kits ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review ARLEN NESS Mn/9dfj Inverted Series Air Cleaner Kit Harley Davidson Ga fits 2016–2017

The **Arlen Ness MN/9DFJ Inverted Air Cleaner Kit** is a meticulously engineered upgrade designed to enhance the performance, efficiency, and longevity of the air intake system on **2016 2017 Harley-Davidson models** equipped with the **Milwaukee Eight (MN/9DFJ) engine**. This premium aftermarket kit replaces the stock air cleaner with a high-flow, inverted-style system that not only improves airflow but also introduces a more aggressive, sport-tuned breathing characteristic that responds dynamically to throttle inputs. Crafted from durable materials, the kit features a **high-quality foam pre-filter** that effectively traps larger debris, dust, and road grime before it reaches the main filter, ensuring cleaner air enters the engine and reducing wear on internal components. The **inverted design** eliminates the need for a bulky top-mounted filter housing, allowing for a cleaner, more streamlined look under the bike s saddlebag or fairing, while also providing easier access for maintenance. The kit includes a **custom-fitted intake tube** that integrates seamlessly with the stock airbox, ensuring a secure and leak-free connection that maximizes airflow efficiency. Whether you re cruising on the highway or pushing the limits on the track, this kit delivers a noticeable boost in horsepower and torque by reducing intake restriction, allowing the MN/9DFJ s powerful V-twin to breathe more freely. Additionally, the improved airflow helps maintain optimal engine temperatures, promoting better combustion and reducing carbon buildup on intake valves. Backed by Arlen Ness s reputation for precision engineering and reliability, this kit is a must-have for riders seeking a balance of performance enhancement and aesthetic refinement without sacrificing the stock engine s stock reliability.

### **Pros and Cons of the Arlen Ness MN/9DFJ Inverted Air Cleaner Kit for 2016-2017 Harley-Davidson**

1. **Improved Airflow and Performance** The inverted air cleaner design reduces turbulence and backpressure, allowing for better airflow into the engine. This can lead to improved throttle response, especially noticeable in stock or lightly modified engines.

2. **Enhanced Cooling** The inverted design helps keep the air cleaner cooler, reducing the risk of heat-related issues like oil breakdown or premature filter clogging. This is particularly beneficial in hot climates or during high-speed riding.

3. **Easier Maintenance** The top-mounted design makes it simpler to access and replace the filter without removing the entire airbox. This reduces downtime and labor compared to traditional side-access air cleaners.

4. **Better Filter Efficiency** The kit often includes high-quality filters (such as K&N or similar) that provide excellent filtration while maintaining airflow. Some versions offer washable filters, extending their lifespan.

5. **Aesthetic Appeal** The sleek, modern look of the inverted air cleaner can enhance the bike s appearance, especially if paired with matching intake pipes or headers.

6. **Compatibility with Modifications** If you plan to add an intake system or headers later, the inverted air cleaner is a logical first step, as it prepares the bike for further performance upgrades.

7. **Reduced Oil Consumption** By improving airflow and cooling, the system can help mitigate oil consumption issues that some Harley engines experience, particularly in hot conditions.

8. **Positive Community Feedback** Many Harley owners report noticeable improvements in power delivery and reliability after installing this kit, with minimal issues reported in well-maintained applications.

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1. **Cost** The Arlen Ness kit is more expensive than a basic OEM air cleaner or aftermarket alternatives. Prices typically range from $200 to $400, depending on the specific model and included components (e.g., intake pipes, clamps, or filters).

2. **Potential for Oil Leaks** If not installed or maintained properly, the inverted design can sometimes lead to oil leaks from the PCV (Positive Crankcase Ventilation) system or gasket failures. This requires careful sealing and periodic inspection.

3. **Requires Professional Installation** While the kit is designed for DIY installation, improper fitting of gaskets, clamps, or seals can lead to leaks or airflow issues. Some riders opt for professional installation to ensure a tight seal.

4. **Limited Power Gains Without Further Mods** The kit itself provides airflow benefits, but significant power gains (if that s the goal) may require additional modifications like headers, a high-flow exhaust, or a tune. Expect modest improvements unless paired with other upgrades.

5. **Filter Replacement Costs** If the kit includes disposable filters, replacement costs add up over time. Washable filters (if available) reduce this expense but require proper cleaning to maintain efficiency.

6. **Potential for Backfires** In some cases, the improved airflow can lead to minor backfires at the carburetor or throttle body, especially if the engine is not properly tuned or if there are vacuum leaks.

7. **Weight Consideration** The inverted air cleaner adds some weight to the front of the bike, which may slightly affect handling dynamics, though the impact is generally negligible.

8. **Not a Universal Fix for Engine Issues** While the kit helps with airflow and cooling, it does not address underlying engine problems such as worn valves, piston rings, or carburetor issues. It s a performance accessory, not a repair solution.

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The Arlen Ness MN/9DFJ inverted air cleaner kit is a solid choice for Harley-Davidson owners looking to improve airflow, cooling, and maintainability without drastic modifications. It strikes a balance between performance benefits and practicality, making it suitable for both daily riders and enthusiasts planning further upgrades. The kit s ease of maintenance and aesthetic appeal further add to its appeal.

However, it is not a "set-and-forget" solution. Proper installation, regular maintenance (filter checks, gasket inspections), and potential additional mods (like headers or a tune) will maximize its benefits. For riders prioritizing reliability and subtle performance gains, this kit is a worthwhile investment. Those seeking dramatic power increases may need to pair it with other modifications.

If you own a 2016-2017 Harley-Davidson (especially an Evolution engine like the Twin Cam or Milwaukee-Eight) and want to enhance airflow, cooling, and overall engine health, the Arlen Ness inverted air cleaner kit is a **highly recommended upgrade**. It is particularly beneficial for riders in hot climates, those who frequently ride at high speeds, or anyone planning to add intake or exhaust modifications later.

- **Install it professionally** if you re unsure about sealing gaskets or clamps.

- **Pair it with a high-quality filter** (e.g., K&N or similar) for longevity and efficiency.

- **Monitor for oil leaks** during the first few rides and address any issues promptly.

- **Consider additional mods** (like headers or a tune) if you want more power.

Overall, the Arlen Ness kit is a practical and effective choice for Harley owners looking to optimize their engine s performance and reliability.

Details:

Arlen Ness Inverted Series Air Cleaner Kit for 2016 - 2017 Harley Davidson ga: Status: In Stock.

part #: mn9dfj price

• $503.65

specifications intakefuelmotorcycle:

• for makes: Harley, Davidson
• for years: 2016-2017
• brand: Arlen Ness
• mpn: Mn/9dfj
• color: Black
• compatible year: 2017 2016
• compatible make: Harley Davidson
• compatible model: Flstf Fat Boy
• bundle description: 1 Pc Genuine Arlen Ness Inverted Series Air Cleaner Kits
• type: Inverted Series Air Cleaner Kits
• core charge: Free No Core Charge
• fitment type: Direct Replacement

seller intakefuelmotorcycle:

• rating: 98.7%
• city: Multiple warehouses
• # reviews: 17259

shipping intakefuelmotorcycle:

• class: Standard
• transit: 3-5 Days
• cost: $0.00
• service: Standard
• type: Fixed

returns intakefuelmotorcycle:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

offer intakefuelmotorcycle:

• quantity: 1
• options: Ship-to-home
• started: February 8, 2026
• availability: In Stock
• sold: 0

payments intakefuelmotorcycle:

• other
• wallet: Paypal
• credit card: Discover

general intakefuelmotorcycle:

• condition: New
• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery

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