K&N XStream Top Universal Air Filters take performance to the next level with the addition of a filter within the filter's top adding more filter area for higher air flow and a longer service interval. The XStream Air Filter provides awesome air flow and outstanding filtration. When racing, in any environment, racers need all the protection and airflow they can get. K&N delivers. All K&N universal air filters are constructed with ultra-strong moulded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16 inch (1.5mm) to fit in-between sizes. K&N universal air filters are washable and reusable.

Part KNRX-3990-1 Product Specifications
Product Style: Round Tapered Universal Air Filter
Air Filter Shape: Round Tapered
Base OutsideDiameter: 6 in (152 mm)
Top Outside Diameter: 4 in (102 mm)
Flanges: 1
Flange Inside Diameter: 3 in (76 mm)
Flange Length: 0.938 in (24 mm)
Flange Type: Centered
Height: 8.688 in (221 mm)
Filter Material: Cotton Gauze
Top Style: X-Stream
Top Material/Finish: None
Filter Re-Oiling Amount: 1.5 oz (44 ml)
Footnote 1: 1/4-20 Jack Nut Inserted Into Filter Top

Product Reviews for KNRX-3990-1 - K&N