K&N RK-3950 Street Metal Air Intake System for Select 2001-2017 Harley-Dav

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Product Specification:

SKU:KNNRK-3950

MPN: RK-3950

UPC: 024844364647

Weight: 5.0 lb

Type: Cold Air Intakes

Vehicle Fitment

2001-2017 Harley-Davidson Dyna / Softail / Twin-Cam models (see manufacturer vehicle-application list)

Fitment Notes

Replaces the stock OE air cleaner - direct bolt-on installation with included hardware
Built-in breather system replaces external OEM breathers
Not legal for use in California on pollution-controlled vehicles unless exemption applies

Features

Oversized high-flow K&N cotton-gauze air filter for enhanced airflow and engine breathing
Cast-aluminum high-volume housing with integrated velocity stack for optimized air delivery
Washable, reusable, pre-oiled air filter for reduced maintenance and long service intervals
Improved throttle response, stronger engine sound, and noticeable horsepower gain (~4.85 HP @ 4851 RPM)
Matte-black powder-coated housing with sanded-fin styling for aggressive, custom look
Complete mounting kit included - simple installation typically under 90 minutes
Durable construction aimed at long-term reliability under street or cruising conditions
Replacement filter element: E-3987

Specifications

Air Filter Material: Cotton Gauze
Filter Height: 2.469 in (63 mm)
Overall Intake Assembly Height: 3.25 in (83 mm)
Estimated Horsepower Gain: 4.85 HP @ 4851 RPM
Weight: ~5 lb (2.2 kg)
Air Filter Color: Red
Housing Finish: Matte Black Powder-Coated Aluminum
CARB EO Number: D-269-59 (not legal for sale/use in CA on pollution-controlled vehicles)
Includes: 1x air intake housing, 1x high-flow air filter, complete mounting hardware

Included Components

1x Cast aluminium intake housing with velocity stack
1x High-flow K&N cotton-gauze air filter (pre-oiled)
Mounting hardware kit (bolts, gaskets, breather fittings, etc.)

Product Description

The RK-3950 Street Metal Air Intake System from K&N replaces the restrictive stock air cleaner on compatible 2001-2017 Harley-Davidson Dyna, Softail, and other Twin-Cam models with a high-volume cast-aluminum housing and oversized K&N high-flow filter. This upgrade significantly improves airflow, resulting in stronger throttle response, enhanced engine sound, and an estimated horsepower increase of approximately 4.85 HP under dyno conditions. The integrated velocity stack and built-in breather system deliver smooth, efficient air delivery while maintaining clean intake routing.

Installation is straightforward and can typically be completed in under 90 minutes using the supplied parts. The included filter is washable, reusable, pre-oiled, and built for long service intervals - reducing maintenance costs over time. The matte-black housing with sanded-fin styling adds a custom, aggressive look, making RK-3950 a solid choice for riders who want both performance gains and style upgrades on their Harley-Davidson.