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Custom Assemblies > X-Stream Top Filter

List Price: $116.48
Your Price: $78.99

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K&N XStream® Air Flow Tops replace the top of your existing round filter and add a new dimension to engine breathing by feeding your engine all the air it can use. They are washable and reusable just like other K&N Air Filters. [MORE]
  • Air filter top adds filter area
  • Replaces metal factory filter lid with a lid with a built-in air filter top
  • High air flow with excellent filtration
  • Washable and reusable

Available Information

Product Specifications

Air Filter Shape:Round Lid
Filter Material:Cotton Gauze
Filter Re-Oiling Amount:0.92 oz (27 ml)
Height:1 in (25 mm)
Outside Diameter:14 in (356 mm)
Package Contents:1AF LID
Package Quantity:1
Part Number:66-1401XB
Product Box Height:15.13 in (384 mm)
Product Box Length:15.38 in (391 mm)
Product Box Width:2.25 in (57 mm)
Product Style:Accessories
Top Material/Finish:Blue Powder Coated
Top Style:X-Stream
Weight:1.7 lb (0.8 kg)

Customer Feedback

I have a 66 Mustang with a .030 bored 289 fairly well done with AFR heads. When doing a dyno tune, and after doing some primary jetting on the 750 Demon carb we did two pulls. When we put the K&N X-Treme lid and the 14 K & N element back on I had a increase of 17.9 hp and an amazing 22.6 ft. lb. tq increase due to the fact that cleaning the air and directing the air into the carb properly as they are designed to be doing. I'm Amazed!
Bud MacMurchy, Taber, Alberta Canada