K&N Universal X-Stream Clamp-On Air Filter (RX-3990-1)

K&N Universal X-Stream Clamp-On Air Filter (RX-3990-1)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 molded

4 inch inside diameter

5 and 4 psi

Made in the USA for over 40 years

This intake system features an updated

The included oiled cotton filter is a direct replacement for your factory filter

1/8 inch NPT outlet/ barb inlet for 5/16 inch or 3/8 inch fuel line

The K&N 57S-4902 Performance Airbox replaces the restrictive factory air filter and air box

and is adjustable on-the-go

The tube accommodates the factory air temperature sensor and

To help absorb vibration

The base diameter and filter length are 6 inches

Simple and cost-effective horsepower upgrade