X-Stream® Air Flow Assemblies, Filters, and Filter Tops

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

K&N gives you the power you've been looking for with the new XStream® Air Flow Top.

Not only does the XStream® add filter area, it actually redirects airflow inside the filter to pull in more air through the side pleats for even greater performance efficiency. Cleanable and reusable, the XStream® Air Flow Top filter delivers the best protection available for your engine, and comes in a wide range of applications. Sizes include 9-, 11- and 14-inch diameters. The 14-inch tops are available in anodized black, red, blue or polished aluminum trim ring.

11 " ASSEMBLIES
Neck Flange	Element Height	Part # Element	Part # Complete	Total Assy. Height	Color
5-1/8"	2-3/16"	E-1200	66-3110	3-1/2"	Black
5-1/8"	3-1/2"	E-1250	66-3120	4-3/4"	Black
5-1/8"	5"	E-3680	66-3130	6-1/4"	Black
7-5/16"	3-1/2"	E-1250	66-3140	4-1/2"	Black

9 " ASSEMBLIES
5-1/8"	2-3/4"	E-3530	66-3150	4-3/8"	Black
5-1/8"	2-3/4"	E-3530	66-3160	8-1/4"*	Black

14" ASSEMBLIES
STANDARD 9/16" RAISED BASE
5-1/8"	2-5/16"	E-3740	66-3000	3-7/8"	Black
5-1/8"	3"	E-1650	66-3010	4-5/8	Black
5-1/8"	4"	E-3750	66-3020	5-7/8"	Black
5-1/8"	5"	E-3760	66-3030	6-7/8"	Black

1-1/4" DROP BASE
5-1/8"	3"	E-1650	66-3040	2-3/4"	Black
5-1/8"	4"	E-3750	66-3060	3-3/4"	Black
5-1/8"	5"	E-3760	66-3070	4-3/4"	Black

7/8" DROP BASE
5-1/8"	3"	E-1650	66-3050	3-1/8"	Black

DOMINATOR
7 5/16"	4"	E-3750	66-3080	5-1/2"	Black
7-5/16"	5"	E-3760	66-3090	6-1/2"	Black
7-5/16"	6"	E-3770	66-3100	7-1/2"	Black

XStream Pre-Wrap

XStream® Top PreCharger Wraps

Extends your Filtercharger's service interval in dusty conditions.

XStream® Universal Air Filters - Designed for Serious Racers

XStream Universal Clamp-on Filter Diagram XStream® Universal Air Filters - Designed for Serious Racers

(F) Mounting Flange Inside Diameter		Base Diameter		(D) Top Diameter		(L) Filter Length		(FL) Flange Length		(FA) Flange Type/Angle	Custom End Cap Part #	Pre-Wrap Part #
Inch	mm	Inch	mm	Inch	mm	Inch	mm	Inch	mm
2-7/16	62	4	102			4-3/4	121	3/4	19	Centered	RX-4040-1
2-7/16	62	4-1/2	114	4	102	6-1/8	155	7/8	16	Centered^	RX-3820-1	RX-3820PK**
2-7/16	62	4-1/2	114	4	102	6-1/8	155	3	76	Angled 20°	RX-3800	RX-3820PK**
2-7/16	62	4-1/2	114	6	152	6-1/8	155	5/8	16	Centered^	RX-3810-1*	RX-3810PR
2-7/16	62	4-1/2	114	6	152	6-1/8	155	3	76	Angled 20°	RX-3770*	RX-3810PR
2-1/2	63	4-1/2	114	4	102	3-13/16	97	3/4	19	Centered	RX-4010
2-1/2	63	6	152	5	127	5-1/2	140	2	51	Centered^	RX-4950
2-1/2	63	6	152	5	127	6-1/2	165	2	51	Centered^	RX-4860
2-3/4	70	3-3/4x4-3/4	95x121	4	102	5-9/16	141	13/16	21	Centered	RX-5090
2-3/4	70	6	152	5	127	5-1/2	140	2	51	Centered^	RX-4960
2-3/4	70	6	152	5	127	6-1/2	165	2	51	Centered^	RX-4870
2-7/8	73	4	102			4-3/4	121	3/4	19	Centered^	RX-4020-1
3	76	4-1/2	114	6	152	4-5/8	117	7/8	22	Centered	RX-3900-1*
3	76	5-1/2	140	5	127	5-9/16	141	1-7/8	48	Centered^	RX-4990
3	76	5-1/2	140	5	127	6-1/2	165	1-7/8	48	Centered^	RX-4730
3	76	6	152	4	102	8-11/16	220	15/16	24	Centered^	RX-3990-1
3	76	6x8	152x203	5	127	6-1/2	165	1-7/8	48	Centered^	RX-4750
3-1/4	82	4-7/8	124	6	152	3-5/16	84	15/16	24	Centered	RX-4110*
3-5/16	84	4-7/8	124	4	102	4-1/4	108	15/16	24	Centered	RX-4120-1
3-1/2	89	4	102			5-3/4	146	3/4	19	Centered	RX-4140
3-13/16	97	6-13/16	173	6	152	2-1/8	54	3/4	19	Centered	RX-4130-1

* Filter is reverse tapered ** Colors available: PL=Blue, PR=Red, PY=Yellow *** 5/8" vent standard
^ Filter has molded-in velocity stack.

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