K&N XStream® Air Flow Assemblies, Filters, and Filter Tops

K&N XStream® Air Flow Assemblies, Filters, and Filter Tops

K&N gives you the power you've been looking for with the new XStream® Air Flow Top. Cleanable and reusable, the XStream® Air Flow Top filter delivers outstanding engine protection and comes in a wide range of applications. Sizes include 9, 11, 14 and 16-inch diameters. The 14-inch tops are available in anodized black, red, blue or chrome trim ring.


K&N XStream® Air Flow Tops

DiameterPart#Color
9"66-0901Black
11"66-1101Black
14"66-1401XBBlue
14"66-1401XPChrome
14"66-1401XRRed
14"66-1401Black
16"66-1601Black

K&N XStream® Air Flow Assemblies

K&N XStream® Air Flow Assemblies

K&N XStream® Air Flow Assemblies add surface area and redirects airflow inside the filter to pull in more air through the side pleats for even greater performance efficiency. The washable and reusable XStream® Air Flow Top filter delivers the best protection available for your engine.

Total Height = minimum clearance required above carburetor flange.


K&N 14" XStream® Air Flow Assemblies - Standard 9/16" Raised Base - Color: Black

Neck FlangeElement HeightK&N AssemblyTotal Height
5-1/8"2-5/16"66-30003-7/8"
5-1/8"3"66-30104-5/8"
5-1/8"4"66-30205-7/8"
5-1/8"5"66-30306-7/8"

K&N 14" XStream® Air Flow Assemblies - 1-1/4" Drop Base - Color: Black

Neck FlangeElement HeightK&N AssemblyTotal Height
5-1/8"3"66-30402-3/4"
5-1/8"4"66-30603-3/4"
5-1/8"5"66-30704-3/4"

K&N 14" XStream® Air Flow Assemblies - 7/8" Drop Base - Color: Black

Neck FlangeElement HeightK&N AssemblyTotal Height
5-1/8"3"66-30503-1/8"

K&N 14" XStream® Air Flow Assemblies - Dominator - Color: Black

Neck FlangeElement HeightK&N AssemblyTotal Height
7 5/16"4"66-30805-1/2"
7-5/16"5"66-30906-1/2"
7-5/16"6"66-31007-1/2"

K&N 11" XStream® Air Flow Assemblies - Color: Black

Neck FlangeElement HeightComplete Assy.Total Height
5-1/8"2-3/16"66-31103-1/2"
5-1/8"3-1/2"66-31204-3/4"
5-1/8"5"66-31306-1/4"
7-5/16"3-1/2"66-31404-1/2"

K&N 9" XStream® Air Flow Assemblies - Color: Black

Neck FlangeElement HeightComplete Assy.Total Height
5-1/8"2-3/4"66-31504-3/8"
5-1/8"2-3/4"66-31608-1/4"*


XStream® Universal Air Filters - Designed for Serious Racers

To find an XStream universal air filter for your need go to our universal air filter search page, select a style (round tapered, etc.) then choose "Top Style" as one of your search attributes along with "X-Stream". The result will only display X-Stream top filters for the filter type selected.


These filters are legal ONLY for racing vehicles. Not applicable, nor intended for use on emission controlled street or highway vehicles.