$68.99 USD
MSRP $106.29 35.1% Off
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K&N 66-1401

Custom Assemblies > X-Stream Top Filter
  • 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
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.


Available Information

Product Specifications

Air Filter ShapeRound Lid
Filter MaterialCotton Gauze
Filter Re-Oiling Amount0.92 oz (27 ml)
Height1 in (25 mm)
Outside Diameter14 in (356 mm)
Package Contents1 X-Stream Top Lid
Package Quantity1
Product Box Height15.13 in (384 mm)
Product Box Length15.38 in (391 mm)
Product Box Width2.25 in (57 mm)
Product StyleAccessories
Top Material/FinishBlack Powder Coated
Top StyleX-Stream
Weight1.7 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