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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 Top 66-1401XP K&N XStream® Air Flow Top 66-1401XR K&N XStream® Air Flow Top 66-1401XB

XStream Air Flow Tops
Replaces the metal top of your existing round filter.


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

Neck FlangeElement HeightElementComplete Assy.Total HeightColor
5-1/8"2-5/16"E-374066-30003-7/8"Black
5-1/8"3"E-165066-30104-5/8"Black
5-1/8"4"E-375066-30205-7/8"Black
5-1/8"5"E-376066-30306-7/8"Black

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

Neck FlangeElement HeightElementComplete Assy.Total HeightColor
5-1/8"3"E-165066-30402-3/4"Black
5-1/8"4"E-375066-30603-3/4"Black
5-1/8"5"E-376066-30704-3/4"Black

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

Neck FlangeElement HeightElementComplete Assy.Total HeightColor
5-1/8"3"E-165066-30503-1/8"Black

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

Neck FlangeElement HeightElementComplete Assy.Total HeightColor
7 5/16"4"E-375066-30805-1/2"Black
7-5/16"5"E-376066-30906-1/2"Black
7-5/16"6"E-377066-31007-1/2"Black

K&N 11" XStream® Air Flow Assemblies

Neck FlangeElement HeightElementComplete Assy.Total HeightColor
5-1/8"2-3/16"E-120066-31103-1/2"Black
5-1/8"3-1/2"E-125066-31204-3/4"Black
5-1/8"5"E-368066-31306-1/4"Black
7-5/16"3-1/2"E-125066-31404-1/2"Black

K&N 9" XStream® Air Flow Assemblies

Neck FlangeElement HeightElementComplete Assy.Total HeightColor
5-1/8"2-3/4"E-353066-31504-3/8"Black
5-1/8"2-3/4"E-353066-31608-1/4"*Black

XStream® Top PreCharger Wraps
XStream® Top PreCharger Wraps
Extends your Filtercharger's service interval in dusty conditions.

XStream® Chevy & GMC Replacement Lid
XStream® Chevy & GMC Replacement Lid


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.

XStream® Universal Clamp-on Filter Diagram
XStream® Universal Clamp-on Filter Diagram

K&N XStream® Clamp-On Air Filters
K&N XStream® Clamp-On Air Filters

K&N XStream® Universal Air Filters
K&N XStream® Universal Air Filters


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